Going back to the posted topic, I'd have thought that the image of the Burns company's product that has formed most within the guitar market is not that of the Marvin / Shadows Bass and not even that of the Double Six. It is centred around all those intermediate models (later than the original Sonic and Artist) such as the Vista Sonic, the Split Sound (6-string) Bass, the Jazz Split Sound and the Jazz (short-scale) and even the Nu-Sonic, plus the bass versions. These are the guitars which have circulated around the secondhand market since the mid-1960s and which are most familiar to players, even now. I suppose one could add the (original type of) Bison, pre-Rez-o-Tube. Most potential buyers don't even know the model names from that period, but they recognise the guitars.
Of course, the snag is that anything approaching the status of a reissue of these models would need a bespoke reverse-engineered version of the bridge/tremolo system, though perhaps just one type could be fitted to all except the Nu-Sonic. Wimping out and fitting something clearly derived from the Stratocaster unit (no matter whether operated via the fulcrum screws or a version of the knife-edge) just would not cut it.
Everyone who really wants a Marvin either has one or could get one. Burns have already re-made the Jazz Split Sound body shape and neck. It's only the bridge that needs to be rediscovered.