I haven't really got a pickup recommendation, but that's an amazing looking guitar! I've never seen one before.
I'm surprised it lacks midrange given all that mahogany. Maybe it's the neck-through construction? I've never been sure if a neck-through is as resonant as a Gibson-style set neck.
If you have a Miracle Man set on the way, why not try them in the Rico before installing them in your Warmoth? That way, even if you don't like them you'll have a reference point for comparison with other BKPs.