My spare mag is in my left front pocket. For me, a belt pouch would be more problematic to conceal than my IWB 1911. The Blade Tech holster I have will allow me to carry it under a tucked shirt if I need to, but I don't see how a belt carry magazine pouch could be concealed w/o another cover garment.
I do have to check the magazine frequently for pocket lent, but it's just part of the routine.
PS The "maglite" pouch is not really a viable option either.