I sure someone pops up that has your wheel.
And as something brand new, I have another shot in the dark.
There is a bloke named gazza at the SDI forum, that praises his new Ferrari Thrustmaster FF as highly as anyone could wish. He definately doesn't have any problems with his wheel and GP4 thats for sure. I seriously doubt it is the 360 Modena, but it might be a good idea to seek him out, and ask him how he configured his wheel for GP4, and perhaps get his controller config file.
I have yet to spot anyone with the 360 Modena, but I will keep in mind when I browse the forums.
It's only after we've lost everything, that we are free to do anything.