KLM will not go into either SOU or BOH with a 737. I doubt ANY KL service in the future to this region. Smaller UK regional airports are shared by AF/KL and if an established route to either AMS or CDG exists, they are reluctant to dilute the market by opening a link to a second Skyteam hub.
IF KL were to operate out of either SOU or BOH, equipment would much more likely be F50/F70.
Regards
Mike