I have created a Somfy RTS integration that uses an ESP32 and a CC1101 transceiver that is readily available. The radio range is excellent, it supports up to 32 covers per device, and it links your existing Somfy remotes to keep the shade positions and tilt in sync, and it supports the My positions set from your remotes.
The configuration is simple, it requires no coding, and you can update the device OTA so stuff it somewhere and get control of your shades, drapes, and blinds.
The controller is constructed from readily available parts and can be put together without soldering and for less than $20us. Complete instructions on how to connect the parts as well as options for connecting the ESP32 using wifi, hardwired ethernet, and/or POE.
A complete project guide is located here.
Integration for home assistant can be installed via HACS and is located here.