I have no idea if this would work at all with a digital SLR, but I know a photographer who adapted his Hasselblad lenses to a 4x5 camera. He simply cut a hole in a Hasselblad rear lens cap, epoxied it to a lens board and fired away.
Maybe a similar setup would work with an SLR. There would be no autofocus, no auto exposure, so it probably won't work for all LL readers. Or may not work at all.