Here is the brake handle installed. There is only a couple of inches of travel on the handle, so I still at a loss to come up with a parking brake solution. The handle doesn't come nearly close enough to the flap detent bracket to hook it there. I can add a cable or wire, but hooking that on and off the detent bracket won't be nearly as elegant and easy as the old mechanical brake handle which could catch in the detents.
If I were to do this over again I would move the master cylinder back 1 or 2 rivet holes (toward the spar tunnel) so I could use the detent bracket.
I will probably re-make this handle someday, to make a one piece deal.