Hey,
i calculated a change in fork length. On FM1001 120mm the BB drop is 35mm (341mm height), which is still pretty high.
Transition spur 120mm is 336mm (40mm BB drop).
My Titanium softail (160mm fork) is 333mm height (43mm BB drop) and has no problem of pedal hit on the group. Kona ESD is 314mm for instance.
But the seat tube angle of FM1001 120mm will be very steep at 79°
If you climb ultra steep hills, it will be helpful, but if you also ride flat trails, it will be awful.
Why don't you build a custom titanium bike ?