You can't cause OS4.1 (still) doesn't support BPPC's SCSI bus.
You can only use the opposite alas running OS4.1 from A1200's IDE and OS3.9 from BPPC's SCSI
I totally don't understand what you've just tried to say.
Um, and I think I mis-stated b-vision SCSI in the 1st place to confuse it further. I mean using the Blizzard SCSI, or the blizzppc.device. found on the 603e+
EDIT
Ok I think I got it now. I can not believe this, that sucks, why?