The craft leather band for my Pixel Watch finally showed up. It's a decent if unexciting band, but more importantly as I hoped, it provides standard 20mm lugs that click into the watch's custom mounts. The band is using standard pins rather than speed pins, but I have a pin tool so I was quickly able to swap over to one of my old Barton bands that do have speed pins.
Sadly the cool new "Gaucho" band I ordered showed up with the non-buckle side the wrong size (18mm instead of 20mm) so I'll have to do an exchange before I can use that band.