So like the title says, I'm looking for a versatile dual humbucker bass. Looking for something as a kind of in-between bass that can get a sort of t-bird tone, a fat neck tone, and split and get a passable jazz bass tone. Maybe even active/passive to cop a bit of a ray tone. Is there a jack of all trades/master of none sort of bass out there that would suit?
Throwing in another vote for the T-40, one of my favorite basses of all time. People always talk about these as a great emulator of other basses, but the inherent voice they have is basically Thunderbird + Jazz. It would happily do what you're asking, I think.
The necks feel amazing on the T-40 too, I think. Not too wide with a nut width of 1 5/8", not too narrow, thick enough to dig into but not bulky.