Unfortunately, I very much doubt if there are any other cards using B2C2, except the ones from Technisat. I mean, I am aware of the existence of at least 30 DVB-S2 cards, and none of them uses B2C2 except
Skystar S2.
Btw, what is the exact problem with the BDA driver? You said there were problems with some DVB-S2 channels, but what exactly (stuttering, doesn't lock, ...etc).