Been working on these throws for stub switches.
I felt the brown one in back was too large, so I made one a little smaller.
Works kinda like a Harp Switch Stand.
Thinking that with a little modification it would work on a 3-way stub.
Nye, Inyo & Esmeralda Railroad
Some think me crazy - others just cheap, but I would say don't over engineer the switch stands.
Your prototypes look pretty stout.
I made some out of card stock and wood!
The angles at bottom and the oval tops with notches are card stock.
The uprights are basswood.
The pivot is on a straight pin and throw bar is brass wire.
After adding thin CA to harden them they are pretty sturdy.
Card stock is so easy to work with.
I agree with adding notches to lock in position.
The pivot pin could be in a slot allowing you to lift handle move and press back down into notches.
Attached is a picture of one of mine.
Only fiddly part is determining the distance between pivot pin and throw bar point so that the throw is correct for track movement.