Thank you both for the quick reply. Cutting the power was the necessary evil option to keep the household sane with the help of keeping physical buttons. Further experimenting did not yield any good results so since I’ve got mainly Gira switches and outlets in this house I’ve bought a couple of Senic Friends of Hue switches. I also have a Hue Bridge V2 lying around so the connection was fairly simple. Homey still as the main hub, Hue Bridge V2 for the connection to the switches exposing to Homekit through Hue app, all the other branded (tradfri mainly) lights exposed to HomeKit through HomeKitty. Works like a charm.
These fit straight into the existing frames and look OEM of the switches but don’t actually have any connection to the physical switch. So the wires running from the bulb to the switch are permanently connected using a WAGO connector and now there is even all the room for activities in the switch cavities.
Not the best practice to permanently have them on with no means to reset or cut power if necessary but then it’s always possible to shut them off from the main utility box.
Thanks for now! Will build up the system from here onwards.