Launch-model Fat PS3s are backwards compatible iirc

20GB Fat Launch models to be specific

Do you have a gamecube or wii?

Then I'd highly suggest looking into getting one, the game itself is cheap for Gamecube versions, and Gamecube controllers used aren't tooo bad of prices.

I would not suggest getting the 2-7 dollar unofficial gamecube controllers.

welp

Try different 3rd party controllers? There are some that do wildly differ from standard controllers, maybe even get some kind of adapter to take a different controller to be compatible with gcn ports.

Otherwise, dunno what to tell you