Isn't that what IDW are doing with their Khan comic mini-series?
I'd much rather an anthology along the lines of Pocket's Myriad Universes
where we see tons more "What if...?" Khan stories. One of the earlist advertised MyrU stories (back when it was called Split Infinities) was "what if the S.S. Botany Bay was discovered by the Enterprise-D?", but sadly it never materialized.