IIRC, Michael's basses don't detune at the bridge, only the headstock with four different Hipshot Xtenders. Our very own wierd cousin Bryan R. Tyler has this setup on an Elrick as well.
That's not true. The Hyperbass model has a detunable bridge that is actuated by a lever attached to a cam that has three positions. One lever the top two strings, the other the bottom two. It's tuned an octave up. Obviously the headstock detuners too.
His standard, Sonus-based model in the standard octave, only has the headstock detuners.
Zon's detunable bridge is not available without buying a Hyperbass. The price difference bwetween a model spec'd out exactly like a Hyperbass (without the bridge) and the Hyperbass is roughly $2800. That's an expensive bridge.
It's made by a seperate company as I understand it, but you'll never be able to get one.
I contacted Hipshot a while back about a bass version of the Trilogy, and they have not responded back. It's a much heavier version of Zon's detunable bridge, and far less attractive in how it works, as well. But, potentially available.
I have a fully CAD'ed model of a detunable bridge that is different to both Zon and Hipshots, and is decently compact and adjustable. I haven't tried it out yet, though. But...