After some cases of vandalism (objects inserted in the lock from outside) I would like to get rid of this single point of failure by adding, on the internal side of the lock, an electro-mechanical mechanism to turn the lock from the inside. It would be powered by an Arduino.
I know that there are electronic locks (the ones I saw had various issues) or anti-vandalism ones (no electronic parts) but I would like to try to roll out my own.
The problem I am having is that I could not find anywhere an insert which would be
- normal on the outside part of the door (a classical hole for the key)
- hackable on the inside part of the door,
probably something like this
where I could attach something (a motor for instance) instead of the knob.
Do such inserts (cylinders) exist?