Nice write up, thanks 
You may have a look at FIND.
Take a look at the expire binding. It will expire the ON state to OFF (or OPEN to CLOSED) after the time you set it to. But still you won’t detect any new motion because of the default sensor dead time.
Example: { channel="mihome:sensor_magnet:158d0001a984ba:isOpen", expire="5s,state=CLOSED" }