My preference is for the simplest, smallest M scaler, with minimal buttons and options, with at least a USB and toslink input, maybe some other digital inputs (RCA/XLR/BNC) to mimic what DAVE provides.
It would be a low height, flat topped base for DAVE to sit elegantly on top of. If that's too hard, then my second preference would be a small footprint black cube that can be hidden round the back. At this is level, why would anyone use anything other than the full 1M taps? Other than to maybe tinker around for the first couple of hours. A single button to toggle inputs, and optionally another button to toggle taps. Maybe some LEDs to show status.
A networking option would be interesting, but ONLY if that includes Roon Ready and has a SQ at least as good as current rendering champs, such as SoTM 200 Ultra or UltraRendu. If the networking function can't handle both these points, then stop wasting our time and money and leave it out (or have it as a chargeable option).