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.