Clutch Fork Geometry Woes...

1/2 inch bigger in diameter? or taller?

All I know is what I have heard and that is that 9.5 parts do not interchange with 10.5 parts.
Looking at your parts tho, I see a very tall fork pivot. It would seem that a shorter one might work. Or, probably idealy, a shorter release bearing, BUT, probably NOT with that fork. IMO, you just need the bigger BH.
I have never done your swap so hang tuff, someone who has may be along soon.

BTW; nice camera-work.

Butyou know, the more I look at it, I'm starting to suspect that the 10.5 fork is not seating on the pivot properly. If you have a 9.5 fork try it, I bet it slides right into position.

BTW;
Once you have the right parts, the Fork should rest between the forward-most edge of the window, and the half-way point; and end (clutch depressed) about halfway between the rearmost edge and the half-way point. It can rest closer to the front edge, because as the disc wears, the clutch will naturally move to the rear.