I've already spent quite some time looking up keyboards.
I think I've narrowed down to the following:
- Glove80
- Microsoft Ergonomic Desktop
- Perixx : PERIDUO-505
- Mobility Lab : Clavier Sans Fil Ergo K30W
- Kinesis MWave (It's QWERTY and I need an AZERTY but I believe I can move the keys around).