If it’s using the standard Somfy RTS protocol over 433mhz (check with somfy on it) the ZRTSI would work. It would be limited to open/close and preset positions though.
Unfortunately I don’t believe that unit is made for the UK market.
The Tahoma is huge over kill.
At the moment i’m considering soldering to the remote and controlling with a dry relay. Would only have up and down then you as a third connection would be required for the middle button to stop at a set place.