I think you'll need thinner side spacers, cause the alnico 8 bars are standard sized, and the ceramic bar on the miracle man is huge
I had this magnet in a duncan custom
worked really well
you'll probably lose some output and tightness, but it fills the midrange and smooths the highs
if you can make the spacers (with some piece of wood stick) or take them from another pickup and you're confident to do the magnet swap, then do it and tell us how it sounded :D