Your use case (riding powder in hardboots) is not one that Bomber was trying to address with the design of the Trench Digger. I took a look at the Phantoms. Nice looking, but those two tiny hold-down points are not going to cut it for carving. But you were probably not suggesting to just take the Phantom as-is and use it for carving. I think you were suggesting a simple, lightweight, flat design with minimal moving parts. We've already been there with bindings like the Burton Race Plate. Bomber also had a binding like that called the Toaster. The original Trench Digger was similarly minimalistic but added a cant disc. The TD2 and 3 came into existence because of the shortcomings of simple bindings - no adjustability other than shims (talk about a kluge), and no suspension.
That said, I've felt for many years that Bomber should have offered custom machined bindings for a premium that would be separate toe and heel blocks machined to your desired cant/lift angles. Elastomer suspension could be added or not. Of course you'd have to get a custom board or isolation plate with inserts placed accordingly, but that wouldn't be a big deal at this level. I think this would be the lightest, lowest, simplest (aside from the initial configuration) solution. Obviously they wouldn't get rich selling these, but it would work great on an isolation plate or a bare board.