Drive a lot in France but rarely at night and even more rarely on unfamiliar roads. If I do, just set the headlights to the loaded position 3. This doesn't dazzle oncoming vehicles with dipped headlights, but limits how much one can see.
Tried Eurolights (eBay, Halfords) beam adaptors on a previous car and while they work well, do not leave them on for more than a week or two in the summer sun as they will never come off.