OK, I picked up a tranny from Ebay. I then installed a FOC conversion and the wide ratio gear set. I can see where you can't have an autoshifting tranny while locking it so reverse and braking work.
So, I removed the first gear and bearing altogether. Then, I removed the shifting tension screw, spring, and ball from the clutch and put a 4mm screw in its place. I cut the head off so it will fit in the second gear cup. I figure this will give the now locked clutch something else to grab onto instead of just the single clutch arm. I had to file down the threads on the screw a little so both the clutch arm and the screw shaft were against the pins at the same time.
While the clutch arm was held open and positioned on the "grabber" pin, I filled the entire area with plastic epoxy. If that isn't locked, I don't know what is!