Here’s the current status, not quite resolved:
Our current Somfy remote only has a pair signal and three control signals: Open, Close, and “my” (a favorite position). This is the full set of signals generated by the Somfy RTS controller for window shades and other window coverings with no controllable “angle”. So for these types of devices, you should be good to go.
However, this is just a subset of the protocol used by blinds, which includes signals for “Increase the angle of the blinds”, “Decrease the angle of the blinds”, and has long-press controls.
We got @mikibe a new controller to test out assuming that just a “long press” sort of button would solve the problem, but it didn’t work at all. We now have some of these blinds set up in our lab and we’re studying them. We hope to have something out in a few weeks.