The wireless dongles that will work with the pbo are limited to those that use the realtek drivers for the foreseeable future.
"Here are the chipsets from Realtek that are supposed to work (you find these in the specs for the Wifi usb adapter, it should work):
There may be other adapters that work- but they'll all use the chipsets above (because there are wireless drivers for those chipsets built into the linux install (it's hard to back-port drivers to the old/special linux kernel used).
I would start by googling for those chipsets on sites that you can buy from in France and see if anything comes up. Sorry for your grief.
(By the way, I really only had luck using a second router as a wireless bridge- a different approach to the ethernet issue, bigger but more reliable)