We've been testing many variations of custom knob designs for our future products which also includes inclusion of dual-concentrics to achieve density without sacrificing ergonomics. We are very close! We have some prototypes being printed out of resin then we'll fire off an order with Kilo International, a company who makes extremely high-quality machined knobs.
And check out the render, courtesy of Mr. Hannes:
And the resin prototypes: