Going back to sanctum sounds good solution but if system allows those portals could be also shown as conduits to players, everyone should be able to use return sanctum anyways.
Good to that there is talk about warp costs. I haven’t seen much talk about that, it would be need to be counted from entering survival planet or parallel networks could become new way as those wouldn’t need any oorts and warping from orbiting creative wouldn’t cost much.
My favorite suggestion for portals has been this time debuff which would allow use other portals if said long enough in creativel.