~~The only problem with that scenario is that you are left with a Tuvix, as well as Neelix. Would you just airlock them tf out?~~ (sry, reading skills absent atm)

Yes, this would be an acceptable solution that would have been taught at the academy for generations to come! Bravely saving the life of both a prominent lieutenant (later rising to the level of captain) and the plant whilst stating a clear line against any such abominations.