Would it be possible to boot the vampire with kickstart 1.3 and emulating 68000? That way you could both run the modern Amiga experience and go back to full compatibility with some of the original A500 games and demos.
There might be other ways of doing this, so apologies if it is a stupid question. I left the Amiga after my 500 and only recently with the Vampire making my way into the more modern experiences. My original A500 is one of the very early ones with OCS and it would be great to boot in that mode as well.