Have you looked at doing a right fork mount JR Counter?
With the increasing use of disc brakes on bicycles, the mounting of the new JR Counter on the left side is increasingly difficult.
Could you not swap out the counter - with a left hand shaft extension totalizer. When mounted to your existing JR base - it would allow for a bicycle mounting on the right fork?
Reddingtoncounters.com - Model 14 totalizer, top coming, left hand shaft, 3000 cpm, base mount.