Well, I am back, i just realised that maybe the smart relay thing will be doable.
Let me explain
My dumb system consist on a internal device, wich is a screen with various buttons and a telephone.
Obviously I open the door from within this device, so this woke up an idea, would it be possivle to taka advantage of the old wiring and installing the smart relay indoor, make it open the lock the way you said before?
This is how it is wired
And this is the manual
Do you think i can test the opener with a spare sonoff r4 mini I have myself?
By the way, the syatem is poweres by this
do you think I can bypass the current wiring and connect directly the r4 mini to the lock to test it?