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Not useful, because these flags, are regional flags, just like the Catalan flag, after if you want to add them all. 
https://fr.wikipedia.org/wiki/Liste_des_drapeaux_des_r%C3%A9gions_et_territoires- _fran%C3%A7ais
By cons you can add the Kanak flag for New Caledonia because even if not recognized, it is used officially.
https://fr.wikipedia.org/wiki/Front_de_lib%C3%A9ration_nationale_kanak_et_social- iste#/media/Fichier:Flag_of_FLNKS.svg
https://fr.wikipedia.org/wiki/Nouvelle-Cal%C3%A9donie
Especially on municipal vehicles.
https://caledonie-ensemble.com/wp-content/uploads/2013/03/Police-municipale-canala.jpg
https://la1ere.francetvinfo.fr/image/WNCPUUkXWgPbnRCHCyeEdf4GZzE/930x620/filters- :format(webp)/outremer/2019/10/03/5d95d18f76ebb_garde_champetres_2-560919.jpg
https://scontent.fcdg4-1.fna.fbcdn.net/v/t1.18169-9/12096261_1153799801300998_74115206157179383_n.jpg?_nc_cat=104&ccb=1-7&_nc_sid=973b4a&_nc_ohc=kwIYRziYW28AX8GFlMR&_nc_ht=scontent.fcdg4-1.fna&oh=00_AT_8qqYwOadgYt_e1URjSguoygDyYU02aQgE3dh8b_voew&oe=6362B166
https://fr.wikipedia.org/wiki/Liste_des_drapeaux_des_r%C3%A9gions_et_territoires- _fran%C3%A7ais
By cons you can add the Kanak flag for New Caledonia because even if not recognized, it is used officially.
https://fr.wikipedia.org/wiki/Front_de_lib%C3%A9ration_nationale_kanak_et_social- iste#/media/Fichier:Flag_of_FLNKS.svg
https://fr.wikipedia.org/wiki/Nouvelle-Cal%C3%A9donie
Especially on municipal vehicles.
https://caledonie-ensemble.com/wp-content/uploads/2013/03/Police-municipale-canala.jpg
https://la1ere.francetvinfo.fr/image/WNCPUUkXWgPbnRCHCyeEdf4GZzE/930x620/filters- :format(webp)/outremer/2019/10/03/5d95d18f76ebb_garde_champetres_2-560919.jpg
https://scontent.fcdg4-1.fna.fbcdn.net/v/t1.18169-9/12096261_1153799801300998_74115206157179383_n.jpg?_nc_cat=104&ccb=1-7&_nc_sid=973b4a&_nc_ohc=kwIYRziYW28AX8GFlMR&_nc_ht=scontent.fcdg4-1.fna&oh=00_AT_8qqYwOadgYt_e1URjSguoygDyYU02aQgE3dh8b_voew&oe=6362B166
