I've travelled in France and other countries. s,
1) The LED projector headlights cannot be adjusted,with stickers (but bear in mind beam height aim may need adjusting depending on your loading. ) So far I have only used them in Tunnels, where they were no problem,good beam, and didnt dazzle anyone.
Led lights are quite familiar to police in France and its unlikely they would notice the absence of beam converters -especially as they wont be dazzling any one. If you are worried about over zealous police, take a French translation of that section of the handbook. If despite this they insist on issuing a fine, they are only going to look fools to their senior officers when you are able to prove they were wrong.
Not sure about France but in most countries that require you to carry spare bulbs specifically exclude LED ones. So just carry amber 21 w and any other that are conventional. If you have an obsolete bulb kit you might as well carry it but I wouldnt buy one specially. . But I suppose ultimately they might not let you continue driving with a blown LED .They seldom blow and are not really a DIY job anyway so it would be a garage job/Tow, ( or wait to morning, or the gendarmerie have gone home. (and not hiding round the corner)
Yes I got a Crit aire You get a mauve class 1.. They are not expensive but may take a couple of weeks to arrive. No problem if it doesnt arrive before your trip. The site says its sufficient that its on record that you have applied.
In many cities and Departments the need for a critair only takes affect as a temporary measure if pollution levels are high, due for instance to atmospheric condition. And this is announced on Local TV and Radio ! (in French)
So it makes sense just to have one. It lasts the life of the car and no need to worry it being on sat nav.
Its much more likely you will need an Umwelt 4 Zone sticker when driving in Germany. Some quite small towns have a Zone. I think Google warn you if your plotted route enters a zone. But as with the critair you might as well just get one.
I got mine from the local government in Berlin (its valid all over Germany,and lasts the life of the car ) I think it costs 6 euro inc postage. There are other towns and web sites that issue them but some charge 12 - 14 Euros. .
https://www.berlin.de/sen/uvk/en/environment/air/low-emission-zone/vehicle-sticker/Not needed Breakdown cover yet in UK or Europe. Its worth reading the cover in detail. I think european cover might only extend for a trip of less than 3 months. (not a problem for most)