Dear Ken,
Your mechanism ( regarding to a canard, as an extra ) is very impressively complex and professional.
It is very good example how many ways are given to solve similar tasks.
I prefer minimal amount of bolts, and do not trust factory made parts (balljoint, etc.).
The good old "hook-and-lever" , or "tongue-and-hook" type junction satisfy me. Locking: a "@" -formed 1 mm dia tiny musicwire, snapped into the hole, bored into the end of 2,6  mm steel (spoke) hook.
Looks primitive, but absolute safe and vibrationproof.
I dis-assembled one "tongue-and-hook" junction, look photos.