As I read through this thread I changed my mind on what I'd want for this suggestion. At first I thought there definitely should be platform to platform transfers, and there shouldn't be any cost to do so.

I see the point that it could remove a lot of the current intended challenges, and that alone ...

The other post discusses reusing trash slot items, but in case that's not feasible; I think it's important to have this topic around, because not moving ingredients to the trash slot in the first place would solve a lot.
I don't mind having to deal with extraneous ingredients when switching recipes ...