Hi, Belgian keyboard is missing.
It is very similar to French keyboard, except of the special character.
I use successfully your recommended method:
Went to https://www.neradoc.me/layouts/
Gave it https://kbdlayout.info/kbdbe to work with
And downloaded the PY files.
It works for me, but could be made more easy for French typing Belgian.
Thank you very much in advance.