Ok, as someone who believes in the family bed, and who has been co-sleeping for over three years, I have a few questions.
What size is your bed? If its a Queen or King, there should be plenty of room, although a King is best.
How actively does your husband sleep? Does he toss and turn a lot? If he does I can understand his fears, but if he doesn't, he is just being overly fearful. But better safe than sorry, right?
The way we did it worked great for us. Our room was small so it really helped to do it this way. We put my side of the bed against the wall. Basically it was in a corner; headboard against one wall, side against another. I had to climb into bed from the foot of the bed but I didn't mind.
I put my son between me and the wall. I knew I wouldn't roll on him and I was right. Once you are sleeping with your baby, you sleep a little lighter than you would otherwise, but he matches his sleep pattern to yours. Its been suggested in some studies that it prevents SIDS because the baby doesn't fall into a deep sleep that he can't wake from in case he's not getting enough air. He also doesn't "forget" to breathe because he is matching your breathing patterns.
When the baby is a little older and able to roll over independently, he usually is also big enough to be "felt" by your husband and the threat of him rolling onto him is much less. Mine didn't roll much anyway, so it wasn't a big worry.
As he grew, my son eventually was able to sleep between my husband and I or between me and the wall and we all slept fine.
One last note. Family beds are very common in other parts of the world and only in this country is it frowned upon. When your baby is little, he needs you. He'll only be little once. As he grows, he may decide he wants to be in his own space and that will be plenty of time to transition him.
At 8 months though, he should be old enough to be able to sleep safely between you and your husband without a worry. Try to talk to your husband and see if maybe there are other reasons why he's refusing to sleep with the both of you. If that's the case, it's a whole new ballgame.