I think you have found all of them by now. Don't even think of using a microlight strip unless you are genuinely flying a microlight. I did recently ask for permission for one for the Cub and it's a definite NO, whatever the owner might want. Private (aeroplane)strips in France are just that, private, and you will need written permission for their use from the owner and the relevant aeronautical district, which will take about three weeks. 24 km isn't really very far, now is it?
Have a good wedding!