We've had many cats sent home from the vet with the feeding tube still in. They had to go into foster homes, not back to the shelter, of course. It is managable, but you have to make sure they are not too active. I haven't had to deal with it myself (yet... I suppose I will someday), but as long as you can get the slurry/liquid supplement in, which shouldn't be hard, you'll be set.

I think I still have pics of our one FIV+ boy who had a tube in.. I'll have to look for them.