Might I suggest buying a used B13 distributor?
I'm familiar with the B14 distributor, as I use one with my COP. If it were possible to cut off the protruding high tension stack, and then put a B13 distributor cap on you'd basically be in business, but the problem I think you'll run into is that the B13 cap is slightly larger in diameter and won't bolt on. I could be wrong though, and it's worth a try.