Thanks very much Mr Stefano.
I have built a control box with a Teensy and TMS2209 stepper controller to operate the two M-Zero OBS polar alignment stepper motors. It works either locally (at the mount) by pressing North, South, East and West switches, or remotely via a small remote control, operating 4 relays in parallel with the N-S-E-W switches.
It works relatively well but lacks the software (Indi driver) that would be required to operate it through KStars Ekos. I should add some motor speed control to make it go faster or slower, depending on the distance to the pole.
I will seriously consider the Avalon control box once it becomes available, particularly if it works with KStars/Ekos/Indilib under Linux.
Thanks again for your great products.