Ok - update.
I’ve just installed Soma Smart Shades to my blinds downstairs. The process was not as straightforward, as they are not natively Homekit compatible, but they provide a Soma Connect device that can be used as a bridge, that connects the devices to Homekit. The device themselves retrofit reasonably easily to existing blinds with chains.
Once they are installed and integrated into the Home app, it’s been great. I’ve added a Philips dimmer switch, so that the On/Off buttons controls my August Lock for the door, and the Dimmer Up/Down buttons controls the downstair blinds, so we don’t have to use the phone to do it exclusively.
Overall, my final Home app setup includes:
Front sliding gate, Garage door (via iSmartGate)
Front door lock (via August)
Bedroom and garage lights (via Philips)
Watering system front and back (via Eve)
Blinds (via Soma)
Printer socket switch (via Eve)
Cameras in and outside house and motion sensors (via Omna)
Automation that is OUTSIDE of the Home app that I have to use other apps for:
Home security system
Home heating/cooling system
So my quest for full home automation I think has reached its limit. You don’t want to know the final cost of the above, as it all adds up, but it’s been a fun journey.