Hello @d3vid, you might like to try the changes I made in pull request 95, which use the newer Linux kernel ioctls for configuring uinput devices. I made the changes in response to the “missing tablet capabilities: resolution” error, just as you saw in your list-devices output. After the changes, my setup recognises the tablet and I see it in gimp and inkscape.
After a bit of tinkering, my device appeared also as a pointer as “Network Tablet Pen (0)” . Using it
xinput map-to-output “$( xinput list --id-only “Network Tablet Pen (0)” )” HDMI-0
worked like a charm