Good input from all so far.
As I am concerned about the axle to crown length changing the head tube angle, I did some measurement and calculation.
The rear axle to crown race steering axis (radius of travel for the delta in blade length) is 987.4mm. That makes for a circle of 6204mm.
A 18mm arc (fork 1; 15mm for fork 2) along this circle results in a head tube angle delta of 1.04° for fork 1, and .84° for fork 2.. Correct me if I'm not doing this correctly-my math is a bit rusty.
Factoring an other 1° (it will not accept more precise dimensions) into the CAD changes things a bit.
Fork 1 now has a trail of 64mm for fork 1, and 71mm for fork 2. Bummer.
Looks like fork 3, a hi-ten unit that is 385mm axle to crown race and 50mm rake (58mm trail) will have to be the one.
It is a threaded steerer, and I was hoping for threadless. It also lacks cantilever mounts and mid-blade rack mounts.
Unless I want to "tweak" blade rake that is............