What's painful, a little, is that I am certain there is at least one of these sitting in an office just up the road from me right now. (@ Microsoft)
As for an adapter... Well, I happen to have something to handle the pedal issues already, at least on the T500RS.
Actually, about 10 people have the hardware necessary already, they just don't know it... When the time is right, I'll make clear what the heck I'm talking about.
The CSS is another story entirely. It would be quite simple to just emulate a TH8RS on the PS3 and interface with the CSS. However, I will not do that, at least I won't sell something like that. Ethically, I do not believe it is right. (Piggy-backing on the license Thrustmaster paid for in order to sell what would essentially be a competing product)