I honestly don't think you will be able to get the chain to align well enough to stay on. If it comes off to the inside (which it will) It could really screw up that nice looking mag. wheel.
Custom motored bikes has adapters, and I'm sure a bunch of others do as well. Bicycle designer.com has them. The only ones I have used are ones I made myself so I can't say who is best. You should be patient on this. Their is a guy on here goes by fury on the inside. If you can catch him hit him up on this. Chances are he has already looked at the available options, and he knows a s**tload about bikes.