If I've understood you correctly, it's a shame that you can't mix the P's and the Mudbucker.
I like the idea of the bass for sure, I'd like to see a refined non-signature version perhaps. Single 'normal' P and mudbucker (with the switch going between/blending those) and tidying up the ridiculous fingerboard guff....
I mean who, other than Mr Watt, has double dots on the 5th fret, three on the 12th fret, two on the 17th and wording on the 19th fret? Silly.
Anyway, sounds good at least haha, will be awesome with La Bella flats!!
Si