well, there are a few issues here. first of all, you bypassed kstars/ekos alltogether. you could ask for dev help, ekos definitely knows how to control those motors, the motors are already exposed by the controller. did you look into the INDI control panel for the mount, at the AUX ports? i think you can set them as stepper motors and control them from there, but i'm not sure, since i don't have the upgraded mount.
second, i think avalon already has a working solution for the RA/ALT motors in their new StarGo which is based on INDI. I'll talk to them.

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