In short:
There's not too much clearance with the motor-shaft and FRIDANS-tube, but it seems to work just fine. I added some lubricant for the right-side of blind. Perhaps some bearing would work there better.
Extra parts and V1 are not needed for normal procedure.
Changelog:
13.4.2023: The motor adapter slipped out of the track in the tube once. Added a tighter fit version of motor adapter. It's really tight to get in (some grease helps), but once it's there, it probably works better. You can also configure Home Assistant to stop before the blind hits the stoppers, since that is the critical point with the biggest torque.
8.6.2023: The newer version of the adapter has been working fine for two months on both blinds.
22.6.2023: Added end-spacer which is supposed to go to the right end of the blind tube. Motor spacer goes to left side.
The author marked this model as their own original creation.