Well, to answer my original question, no, long legged humbuckers won't fit into the core Mira without routing a deeper hole, which I’m not going to do. I ordered a pair of Mojotones 59 clones and right now they are on their way back to Thomann.
So in the end I did what I said I wouldn't do and ordered a pair of 58/15 LTs for more than double what I wanted to spend...