I ran into 1 problem with my recent springer quest. The distance between upper and lower trip tree on our bikes is 9" and 8" on all Harleys since 1949 to present. If you were to make a longer shaft it could probably be done and at that point might as well have it machined for the stock bearings.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!