@DaveB I (and others in here) are in the process of dumping the ZRTSI Somfy bridge and accompanying ST custom DH and migrating to a Bond Bridge and using the Bond Bridge Edge driver written by @blueyetisoftware. (he recently added the MY preset position to it)
It works really well, check out this thread.
https://community.smartthings.com/t/st-edge-bond-bridge-lan-beta