I agree, it was maybe too much to allow foreginers join Bretonnias armies and to allow them to recuit "mercenaries" outside Bretonnia itself , but I wouldn't find it too odd if the Wood Elves, who are among Bretonnias closest allies could be recuited in Athel Loren and maybe Quellnesse.

I do however not see why the bretonnians should not be allowed to draft aditional "mercenary" peasants and knights in Bretonnia itself. (This could represent aditional peasant levies and adventurous knights looking for honour and glory.)