It's a possibility, that's as far as I can go . . . it can't be Sharpe, of course, but who knows?
I don't think I'd write with any conviction from the French perspective, so it ain't going to happen.
He won't spend far too much time in the south once the series is finished . . . give him a chance! And the big story in the background of these books is the unification (and, indeed, creation) of England and that, whether you approve or not, was a process that began in the south and worked its way gradually north . . . . I suspect the next book will be set mostly in Mercia, but as I haven't started it, I can't be sure where it will go.
We don't have an itinerary just yet, but I hope it will be posted to the Diary page soon!
Thanks for the recommendation!