Thanks to Henry Kaiser for the heads-up on the Harmonic Master 3rd bridge instrument by the Australian company New Complexity . It has six sets of chorused strings, and all 12 strings have independent tuning positions behind the bridge.
The anchor points behind the bridge are fully adjustable with the maximum harmonic ratio being 1:3 and the smallest around 1:6. You can tune the notes behind the bridge to pretty much any scale you want (or any “non-scale”, for noise musicians). The sonic potential is increased by the ability to run the pickup behind the bridge to a separate output for its own processing. It is available for $1200 AUS.