I honestly doubt anyone has tried that. Would be cool to hear the results though. I would image it would lead to an output mismatch mostly. The neck could very well sound good in the bridge position, allthough very, very different than the bridge. Not as sure on the bridge in the neck, but it could actually work, though my main concern there remains the output. Certainly should give you quite unique sounds.
Damn I really need a cheap experiment guitar, now I wanne try out a AM neck in the bridge and MQ neck in the neck combo xD
I think youŽll just have to try it if you are interrested and if you do I beg you to get back to us with results.