I had a look at the Garage Gym Review, and he surely did a thorough review of the best of all available adjustable dumbbells on the market 2021! Just what I was looking for!
The Powerblocks won, Ironmasters second followed by honorable mention to Bowflex. Very close to what @doogie and @T3hPwnisher suggested.
Availability in Europe is indeed a question these days. Especially since GB has left the EU, which was a great link to the US Amazon. I found a local (Swedish) solution through Coop’s review, which he also rated among the best - Nuobells.
I will need to investigate it further, but will probably go for them for convenience. Nice looking steel plated, with change of weights with a click. Some plastic details can mean questionable quality, which is why they weren’t ranked higher (new = untested in real life).