Let’s lower the forge barrier for simple boons that the devs have added for some functionality (lattice, auto-door etc). You don’t exactly need to have super advanced forging skills, or expensive ingredients to get your hands on them.
A general guide to the forge, character setup, coils, effectiveness etc is found at [Guide] The Methodology to Forging Everything - V2.3 - Added Repair Spanner For the sake of this test I’m going to assume full 1800 vigour and stability, 200% effectiveness, which most lower end chisels can achieve without 24 coils 
I’ll be using the forge simulator to test different ingredient combinations trying to get the new Lattice Boon and find out what you really need at minimum to get it, and what can you do to improve your chances.
By minimum you’ll need 3 ingredients
Just spam Pure Boon Compound until you either get the boon, or don’t and have to deconstruct. You’ll probably fail more often that you’d like, since the boon selection will be totally random.
But it's possible
[ 131 / 1000 ] successful forges [ 13 % ]
[ 121 449 c ] total expenses [ 928 c each ]
Used on average [ 6 x Pure Boon Compound 1 ] [ 0.1 x Setting Resin ] [ 0.9 x Deconstruction Resin 1 ]
We should add
To our deck to target the lattice boon. Let’s use 1 gum first before starting the pure boon spam
And now we're getting better results
[ 494 / 1000 ] successful forges [ 49 % ]
[ 124 908 c ] total expenses [ 253 c each ]
Used on average [ 5.9 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 1 ] [ 0.9 x Venerable Gum ]
What about using 2 gums?
A bit better
[ 507 / 1000 ] successful forges [ 51 % ]
[ 121 169 c ] total expenses [ 239 c each ]
Used on average [ 5.5 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 1 ] [ 1.8 x Venerable Gum ]
It did make a small improvement, but not a huge one so the gum count is up to you. There’s also error margin even with 1000 samples, the forge RNG can throw some really impressive good/bad streaks.
What about some luxury items, like Boon Removal Solvent 1? We’ll use one every time we get a boon that excludes the boon we actually want. In the lattice chisel’s case it’s “undo” and “type change” boons. You can’t get the lattice boon anymore if the chisel has rolled one of those.
Not bad, 99% success rate
[ 992 / 1000 ] successful forges [ 99 % ]
[ 225 660 c ] total expenses [ 228 c each ]
Used on average [ 9.1 x Pure Boon Compound 1 ] [ 1 x Boon Removal Solvent 1 ] [ 1 x Setting Resin ] [ 0 x Deconstruction Resin 2 ] [ 3 x Venerable Gum ]
The result:
You can easily forge these without expensive items, but you will have to deconstruct ~50% of the forges. There will be bad streaks where it rolls something different 10 times in a row. But long term it will get closer and closer to that ~50% success rate. If you have the materials, you can increase the success rate. The average material cost difference is negligible, probably within error margin.
So you’ll need 4 fairly easy to craft ingredients to get a functionality boon like the new lattice one on a chisel.
I did this with DR(Deconstruction Resin)1-3, using 1-3 gums. See for yourself what the results look like. The prices are what I personally pay for my materials with request baskets so take those with a pinch of salt. But for comparison’s sake between setups it shouldn’t matter.
Full data
0 gums DR(Deconstruction Resin) 1
[ 131 / 1000 ] successful forges [ 13 % ]
[ 121 449 c ] total expenses [ 928 c each ]
Used on average [ 6 x Pure Boon Compound 1 ] [ 0.1 x Setting Resin ] [ 0.9 x Deconstruction Resin 1 ]
1 gum DR 1
[ 494 / 1000 ] successful forges [ 49 % ]
[ 124 908 c ] total expenses [ 253 c each ]
Used on average [ 5.9 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 1 ] [ 0.9 x Venerable Gum ]
2 gums DR 1
[ 507 / 1000 ] successful forges [ 51 % ]
[ 121 169 c ] total expenses [ 239 c each ]
Used on average [ 5.5 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 1 ] [ 1.8 x Venerable Gum ]
3 gums DR 1
[ 503 / 1000 ] successful forges [ 50 % ]
[ 121 423 c ] total expenses [ 242 c each ]
Used on average [ 5.2 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 1 ] [ 2.6 x Venerable Gum ]
1 gum DR 2
[ 444 / 1000 ] successful forges [ 44 % ]
[ 112 110 c ] total expenses [ 253 c each ]
Used on average [ 5.2 x Pure Boon Compound 1 ] [ 0.4 x Setting Resin ] [ 0.6 x Deconstruction Resin 2 ] [ 0.7 x Venerable Gum ]
2 gums DR 2
[ 482 / 1000 ] successful forges [ 48 % ]
[ 110 766 c ] total expenses [ 230 c each ]
Used on average [ 4.9 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 2 ] [ 1.5 x Venerable Gum ]
3 gums DR 2
[ 488 / 1000 ] successful forges [ 49 % ]
[ 111 206 c ] total expenses [ 228 c each ]
Used on average [ 4.7 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 2 ] [ 2.2 x Venerable Gum ]
1 gum DR 3
[ 471 / 1000 ] successful forges [ 47 % ]
[ 115 292 c ] total expenses [ 245 c each ]
Used on average [ 4.9 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 3 ] [ 0.6 x Venerable Gum ]
2 gums DR 3
[ 500 / 1000 ] successful forges [ 50 % ]
[ 113 464 c ] total expenses [ 227 c each ]
Used on average [ 4.7 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 3 ] [ 1.2 x Venerable Gum ]
3 gums DR 3
[ 506 / 1000 ] successful forges [ 51 % ]
[ 118 216 c ] total expenses [ 234 c each ]
Used on average [ 4.7 x Pure Boon Compound 1 ] [ 0.5 x Setting Resin ] [ 0.5 x Deconstruction Resin 3 ] [ 1.9 x Venerable Gum ]
3 gums DR 2 BRS(Boon Removal Solvent) 1
[ 992 / 1000 ] successful forges [ 99 % ]
[ 225 660 c ] total expenses [ 228 c each ]
Used on average [ 9.1 x Pure Boon Compound 1 ] [ 1 x Boon Removal Solvent 1 ] [ 1 x Setting Resin ] [ 0 x Deconstruction Resin 2 ] [ 3 x Venerable Gum ]
im dumb with the new forging system. i used to forge godly items at the beginning but now i almost dont forge at all 
If we get the wanted lattice boon though, it excludes unchisel and type change by itself so after that it’s pretty straight forward.