How about just drop in a neck position Buck90 or a set of them from DAllen and call it done? Or a Gibson P94T. Or do like I did and drop in a set of Pure90s from BG Pups (Brian Gunsher) and turn that Armada loose. There are a plethora of makers now making humbucker size and mount P90s. Rio Grand, Vintage Vibe, Kent Armstrong, Harmonic Designs Z-90, Duncan Phat Cats, Lindy Fralin P92s to name a few. Of course you could also go cheaper with GFS or Tonerider.
I agree there are lots of humbucker sized p90s out there. And I am sure the custom hums this guitar comes with are outstanding.
Just a thought because this guitar has my interest and I happen to love the beefy snarl of a p90 in a hunk of mahogany. I trust that the people at the factory know what they are doing and if this axe is meant to have Mm90 or some such variant thereof it will. I was also thinking working man's Armada. No binding and a solid color, ha, ha, . OK I'll stop ^_^