Hey Manuel,
I may well live in France (where SCART was a norm under the name "Peritel"), those have become rare. I phoned a few friends, no luck yet; but you're right, it would clarify the situation.
Search for "Trinitron" on "leboncoin.fr", in order to have a local pickup. I found several good and working CRTs this way (around 30€, sometimes even free because people want to get rid of those beasts) . Be sure to avoid the more modern 16/9 models (100Hz displays with picture digital processing are not so good for MSX and old consoles in general).
In fact, I'm not so eager to own a CRT monitor ; I tend to avoid what I call "heavy" hardware.
Making it work with my setup, most notably understanding the video signal subtleties, proved to be funnier ^^.
!