The overtravel/trip point adjustments are easy, if you have the tools and skills, but then, so are most other mechanical tasks. Salvaging parts from an RC toy looks like far and away the best approach.
If memory serves, the Copals have a positive stop (the manual trip lever strikes the housing at the end of travel) but certainly not all shutters do, and I wouldn't take chances with the insides of, say, a Rollieflex, without checking first.
I built a solenoid-operated shutter release (complete with adjustements...) and it drove a Copal #3 just fine. But it wouldn't work with one of my Ilex #5s, apparently because the actuation speed was too high, and the inertia of parts inside the shutter caused the cable release pin to slip off of whatever it drives. It's a bit difficult to slow down a solenoid, so I went to a pneumatic cylinder. Fun to play with, but its a good thing I'm not trying to make a living at this stuff .
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