Well, Ive tried out ioQuake3 tonight and with some further tweaking and lowered window size its just about playable. Ofcourse it didnt look very pretty at this point but at least my goal was reached.
Funny, I remember, when I got my first pc around 2000 Quake 3 was one of the games I first ran on it and I remember thinking my Amiga would never be able to play that, not its prequel. Ofcourse I was very wrong, that same Amiga now runs Quake 1, 2 and 3.