ok.. let me help you out a bit.
While i dont own a ps2 i have heard that datel's newest action reply will play imports, give you the ability to enter cheats, pretty much combining the freeloader and AR like the gamecube version does already.. so keep your fingers crossed.
A little birdie told me if you head over yto redoctane and drop a arseload of cash you can go home with a drummania, beatmania and guitarfrekas controller..
Hell might as well pick up a ddr pad and a para mat while you are at it
http://www.redoctane.com/bemani-series.html
Good luck with that site!.. i'm still trying to find the official maracas for Samba de Amigo for my DC.. damn Sega of America....