I would say give it a try and see how you like it!
It won't need "impossible routing", assuming your guitar is already routed for a neck humbucker.
One thing, though - the bridge MQ won't sound brighter than the neck model would, in fact the hotter wind will make it sound a little darker. For that reason, many bridge pickups would sound muddy in the neck position, but I don't think that will be a problem with a P-90 like the MQ.
Welcome to the forum, by the way! :D