For me, you have to be more specific about those tone examples. I don't recall Wetton being known for treble on his bass, never heard of the other bands other than Soul Asylum, and to me the bass was an afterthought in that band.
If it's what i think you're after, it's high mid that you seek, 1-2K. I'd look at a P-bass with an ash body, maple neck, nickel wounds, and probably a solid state amp.
Some one said stainless steel wounds; while Rotos will get you there after they break in, most SS strings have an abundance of ultra high and rather scooped mids. You won't get the clanky sound until they break in after a couple of weeks. Nickels are better at high mids, to my ear.
As for pickups, I've heard that sound from MIM Fender P-basses, even though they have alder bodies. But I have two P-basses with ash bodies that can get a clank, the more clanky of the two has a maple fretboard, and uses Fender Custom Shop '62 pickups. SD quarter pounders might have more edge than the CS '62, but in some basses like my maple-necked P, they didn't sound good.
As for amps, I wouldn't look to an SVT for clank; that thing's about punch and low end push. Sunn amps did it in the old days, these days a GK might because they are on the bright side, but they have a mid-cut that might work against you. Definitely not MarkBass, maybe Fender, I'm thinking something that sounds less 'tubey" and more "solid-state."
Hope this helps, and would like to see a video posted of exactly what you mean.
Lovely looking instrument, right? Looked great on stage.
