I hate to post about headphones on a booze and light banter site, but these might actually be interesting (T+A is a very German, engineering-driven audio concern) and are reassuringly expensive at $6400. The DAC/amp is apparently $8900.
https://www.ta-hifi.de/en/musicreengineered-solitaire/
Not to be melodramatic but does anyone else remember a couple of years ago when Tyll was still running the late, lamented Inner Fidelity and wrote that, someday, the really big game changer would be wireless, fuss-free, DSP headphones that were "good enough" for anyone but the most hardcore enthusiasts. Well we're there Hertsens, you magnificent bastard.
Are you talking about the partially overlapped double holes for the C2M1000170D? I guess non-plated, oblong holes would work better, but somehow the layout person got sloppy and slapped on two plated holes (pads).