After going online to places suggested here, I found the Austrian company
Kompass make maps of France to the same scale as the maps I use in Germany, which helps because it avoids confusion. I suspect this is a reproduction under licence of a French map with translation, which is helpful as sadly I don't speak French.
I'm not delighted with the format: the map comes as two smaller maps, both printed on both sides the Rhine valley is of course on the "back" of both maps because that's the way the world has to be, so there may be a fair amount of wrestling with paper. Still, at least I have something to help me navigate wherever I may need to go...