Does it feel good to wear a diaper in the shower?
I'll tell you what: you do it and tell us what you think about it, and i'll do it and tell you what I think about it. Deal?
try a swim diaper
A better solution would be to cut the sides of a trash bag so it fits in your tub and duct-tape it in a few places. That way if an explosion happens, you can just drop the used diaper onto it, wrap the plastic around the SAP-y mess and dispose. If some gets elsewhere, the clean-up process will still be much easier.
No prob. You gain mad skills when you're stuck cleaning rabbit cages in a cramped apartment bathroom.