Jim,
Found two more variations of a diy actuator with a clutch.
Output positions subject to input motion direction 3 by thang010146
https://www.youtube.com/watch?v=Zhz2hkQtg6U
And this one is pretty much how I was thinking of doing it.
Kraftheber mit Spindelantrieb und Rutschkupplung
https://www.youtube.com/watch?v=kQmJMxQA5C8