A note beforehand: I do not have Somfy devices in use myself. What I write here I have learned mostly from this forum, but also from my own research. You can also ask specific questions in this thread.
As I wrote already, I’m not 100% sure if the Connectivity Kit is supported by the Somfy TaHoma & Connexoon app. But if you search the forum, you will find some threads confirming that the Connectivity Kit is supported (sorry, only in German language):
You create the automations with Homey. But the functions and actions that are possible with the Connectivity Kit are specified by the Homey app. So if functions/actions are missing, you can request them by asking the app developer. The same applies to the TaHoma Bridge.
You deleted it already, but here is a link where the differences between the Connectivity Kit and the TaHoma Bridge are listed (again in German language):
