Sounds like you’re off to a good start!
I would agree with the blanking plate option. There are a couple of different battery operated switches that you can then put on top, either the Phillips hue dimmer switch or the Devolo/Popp battery operated controller are popular. With the popp devices you can get many different colours and finishes for the cover plate, so they look a little more elegant. This is @adamv 's photo showing some of the options.
You can talk to people who are using these in the following thread:
You might also want to take a look at some of the threads on the “whole house” quick browse list in the project report section in the community – created wiki. Although most of those are from US members, they might give you some additional ideas.
In particular, I recommend adding some in wall sockets high up near the ceiling line in rooms where you might want LED strips, mains powered sensors, or cameras. This just gives you a number of additional options.