Looking into some of the Adroid-based head units now. They're a lot cheaper and some have some pretty good functionality. I actually found one, a Joying unit, that has a digital output, I could run this directly to my Arc Audio PS8, although I would have to buy the Arc PSC controller, it looks like, to be able to use the digital inputs. That sucks.
I pulled a C-DSP 6x8 to put in the Arc... I could put that back in and use the digital coax and sell either the PS8 or my Helix. Not a bad option...