I might have solved the problems. Steering angle board shape, and can't roll backwards.
There is no rear hub that will let you roll backwards without turning the pedals, so the solution is to go to a regular crankset. I'll have to run a mile of chain (10 feet) and some tensioners.
The regular crankset will create other new problems.
Not enough ground clearance, only an inch to the ground from the pedals and the pedals won't be in a good spot all the time for pedaling from the board. And the cranks will hit the front of the board.
So, the fork needs a modification to raise the front high enough for the cranks. A correction to the steering angle is needed also.
By repositioning the flanges, I get enough height, but needed to use a longer set of forks for the extension. the 26" fork was just the right length. The flange is 60 mm at it's longest point. That leaves out the chrome 20" fork I cut up. Another "engineering anomaly". I thought it may have been another misstep, but I was wrong.
I checked the pedal clearance and it's good now. It may have a better steering angle.
The board needs to be a few inches back to stay clear of the cranks. I measured where to cut the board off flush, but then looked into increasing the slot so it keeps it's length. The rear will extend well past the rear tire, like wings. The holes for mounting will still work, only three which will suffice.
Since the pedals won't have the drive system, they won't be in a good spot to pedal when standing up. So, kicking will be the propulsion method while standing and at the height probably won't be the primary method. The pedals will be used when sitting down and riding. A seat is in the planning stage.