Reverend Gadget has a 72V BMW e-motorcycle with a driveshaft.
That's pretty much the only one I could find a while back when I did a web search.
When I was first looking for a cycle for conversion, I had the opportunity to get a really good deal on a big old Goldwing. I was told by other EV motorcycle people that a driveshaft is relatively ineffecient compared to a chain. Also, the Goldwing just plain weighs a lot, although it would have LOTS of room for batteries.
Here is
Reverend Gadget's cycle
I like the "Forkencycle" Guy's reverse gear setup. I am guessing he did it just because he could. The momentary start button connected to the reversing contactor is a slick little setup.
Low center of gravity on that thing. Any electric motorcycle I have seen so far usually has a suprisingly nice balance to it.