The addition of new Donk-pocket flavours can be approached from two angles. The first would involve making all of the flavours just that: flavour. Aside from their taste and appearance, they would all be more or less functionally the same, being normal food that heals when heated up. The gondola-pockets might still contain gondola-toxin, but individual flavours would have little difference between them.
The second approach would be to give each flavour its own unique use. For instance, spicy-pockets would contain heaps of pyroxadone when warm, making them useful in the event of a plasfire. Teriyaki-pockets, in the spirit of their Japanese heritage, would contain mutadone. Problem is, now one has to bring game balance into the mix. The new flavours can't be useless, but can't overshadow the original Donk-pocket such that it loses its thunder. Plus, if the botany-chemistry rework is carried out, it might increase the value of rarer medicines substantially, which should be considered.
Again, let me know what you think. All ideas are welcome!