If you love your MIA P why do want it to sound like a 'Ray?
If you really do want it to sound like a 'Ray though a MM style p/up in the correct position and an active circuit will get you right in the ball park. Have you considered a P/MM config?
+1
That said, there is something really great about the tried and true P/J setup. I did the MM/P thing years ago and I didn't like it much... Too thick for my tastes, and the MM p'up alone just didn't... work, if you know what I mean. It isn't just the p'up and the preamp that makes a stingray sound like a stingray.