That actually would be my suggestion. The changes are evolutionary, not revolutionary (ie - almost no parts from the oilheads are interchangeable with hexhead bikes - and the electronics, drivetrain, engine, etc are all completely different.) The overhead cam bikes are more evolutionary - the bottom end of the engines are basically the same, wiring is the same, driveline is the same. The changes are to the head and some switch-gear and body panels. To me - that isn't enough to warrant a new forum. I think adding another "tech" forum will simply dilute the potential sharing of common information on models that are actually very much the same.
YMMV..
Easy