I finally got around to attempting the installation of the LMC power lock kit. It was pretty cheap, so wasn't expecting much. And...I didn't get much. No matter how much I fiddle with the linkage that operates the lock, I can't get it to unlock. Locks ok. It seems there just isn't enough power in this actuator to fully unlock it. Live and learn. See video:
https://youtu.be/8HgL5QqT0sk
I don't know if it's worth finishing it, if it only locks. (no unlock)