Hello I browsed through the forum a little bit and I saw that few people didnt know that it is possible to switch the keymap at the beginning of the Arch installation process. :shock:
Here is how to do that :
when you are prompted to, type at the very beginning :
loaddisk /dev/whatever_cdrom_drive cd /tmp/addons/kbd/i386/azerty loadkeys whatever_key_map.map.gz
Easy, eh ?