Commercial products may be scarce; here's a hobby product with some
success:
http://www.amigamaniac.com/
Very nice, thanks!
Can I use AMIGA 2000 kickstart Rom 3.1 ver.40.63 with A500 and one of those
switches from amigamaniac.com?
Can't see why not. Some revision A500's need a jumper between two pins of
the ROM.
Forgot to add, that jumper is already present on the kickswitcher from
amigamaniac if you have a look.
OK, thanks!