Basically as the topic title implies, I'm looking for Rex players in Belgium, preferably English or French speaking (though I also speak a very broken Flemish).

Easiest for me is Saturdays during the day, near Bruxelles, Waterloo, Nivelles, or Gosselies, or easily reachable by TEC lines, though I can muddle things out if need be

You should try finding some players in our gaming group here:

http://z4.invisionfree.com/Mishras_Playground/index.php?act=idx

It's of a store in Halle where people frequently boardgame: Arkham Horror, A Game of Thrones, Mansions of Madness, Battlestar Galactica etc.

Rex I believe is played also