I said that it would be possible, but I personally don't think that it's worth it. Sure it won't be worse than existing gfx cards, but it's a fair bit of effort to make that happen.
Hans
Rogue commented some months ago, that *if* another update for OS4 classic happens, then he would look into adding Radeon 9250 support.
So if that ever materializes, maybe he might also be able to implement your driver.