Been all over this question for some time - and the answer is, like so many things - how much do you want to spend? You'd effectively need a quad-coil pickup winding, and take the top-left/bottom-right (or vice versa, depending on how you're looking at it) coils and make them live. You could get a full set of taps done from this configuration, to get series/parallel, front pair, back pair or the diagonals as above, depending on switching. I was in contact with Armstrongs and they can do this.
I've got a Shuker with a single MM pickup, and I'm the same as you: don't like the Ray sound much. I've got mine switched for series, parallel, and just the front pair. Series or parallel don't sound anything like a P to me, but the front coil on its own sounds a bit Jazz single coil-ish, which I'm living with.
I haven't jumped at the custom job yet, because I'm pondering one of these instead: [url="http://nordstrandpickups.com/products/the-bigman/"]http://nordstrandpic...cts/the-bigman/[/url]