For my first African hunt , I was thinking of Didimala safaris in Namibia ,but they dont offer buffalo. If I wanted buff ,I will probably do as you said and take a shorter side trip for a few days after the plains game hunt. Either that ,or take another short trip just for Buff and whatever happens to come along later on.
I,m waiting to get made redundant from work before I take the trip. Hopefully early next year.