About the 12 minutes loading time, how about making it a multi load, for each quest? That could maybe even help to make it run on a 48k?
Unfortunately, although it was initially my dream for this, it will never run in 48k even if each character was a different load - the graphics for all the rooms take more than the available space on their own. I really want to have everything loaded at once, and be able to swap characters literally at the press of a key. I think multi-loads are awful!