you can expect a nailbomb neck clean tone to be beyond awesome 8)
never split one before, but out of pickups played into a clean channel, i've always preferred the humbucker rather than the split.
i don't do tight crushing things, hermz owns C-pigs and also (i think) alnico pigs, and has borrowed my nailbomb bridge, and he's into what you mentioned, so maybe he can chime in.