That was kind of my point: I don't want just the action stages or "only the good bits". It's not regret, it's curiosity. I'm a late-bloomer Sonic fan who can't be bothered to find a copy, and enjoys playing bad games with friends (and sometimes without); can't help it, and trust me, I've tried.
I'll look into 360 emulation. I'd always assumed I'd have trouble with performance, since this PC is getting ancient by the minute, so that might be a whole... thirty minutes to an hour that I could lose. I expect compensation, of course.
Either way, I'll probably be playing the game another time over when the recompilation drops. And knowing Sonic fans...