dark gray windows interior (basalt gray RAL 7012)

We planned DB703 inside and outside, but it has not been delivered yet. Our window manufacturer recommended stainless steel color, it actually always fits (even with white). Think carefully whether you really want belt winder, simple tubular motors do not cost the world and are a significant improvement in comfort ;) You can also initially use them just with a button/switch and later upgrade them to smart if needed :)

yes, the thing with the motors would be great, but I don't have an outlet anywhere near the windows.

How far away is the next power outlet? When work is being done on windows, it gets dirty anyway. Maybe you can still run a cable into the wall. I laid a flexible cable behind the baseboard and a small cable duct behind the radiator and then under the windowsill to the switch. That way nothing is visible.