Thanks guys!

I meant to reply this morning when I suddenly remembered there are chairs that go over toilets and saw that Am_Fear_Liath_Mor posted that, but didn't get a chance to confirm it.

I think the best bet for the use-case I have is what Am_Fear_Liath_Mor posted which is similar to the Folding Bedside Commode that EMPnotImplyNuclear posted as well. I believe you can remove the bucket and put it over a normal toilet as well.