What if trophies specific to each profession could also be used to summon an exo world with a dungeon tailored to that profession on it. Along the lines of this idea, but instead of colours, it’s something useful for a particular play style.
Use all profession trophies together to summon an exo with a titan on it etc.
Higher tier trophies could also be used towards summoning higher tier worlds and challenges… or just stored on your shelf to show off.