Your question appears to be so basic that I want to make sure I've got it right. If you buy a bus with a wheelchair lift, there is no requirement to remove it in order to convert the vehicle to RV status, or for any other reason. Most of us remove it because from our point of view it's heavy, bulky, rattles, takes up space and we don't need it. A few of us have adapted one to lift motorcycles or ATVs up into the bus for storage. IIRC there was one guy on here a few years ago who was in a wheelchair and did his own conversion, including adapting the controls to his particular situation. No reason you couldn't do the same.