So happy to report that NVidia proprietary driver 495 finally works on Wayland with GBM in KDE 5.23. I had to hunt down over 100 patches, but it all seems to be working rather blissfully smooth:
System Info and Diablo 2 Resurrected running in accelerated XWayland: https://imgur.com/a/kkzOXPr
xwayland backport patch: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/766
qt patch https://codereview.qt-project.org/c/qt/qtwayland/+/373473
egl-wayland 1.1.9 + patch https://github.com/NVIDIA/egl-wayland/pull/38
kwin patches https://invent.kde.org/plasma/kwin/-/merge_requests/1535 and https://invent.kde.org/plasma/kwin/-/merge_requests/662#11743fc803a00c9630cbbe786cdefe525126e957
Applied monstrous DRM leasing patches https://invent.kde.org/plasma/kwayland-server/-/merge_requests/163#5acd093a58f2153fa7f9fd96f979e99bb5737764 and https://invent.kde.org/plasma/kwin/-/merge_requests/662#11743fc803a00c9630cbbe786cdefe525126e957 . Didn't fix panel corruption but required for latest MR1526 pull.
Everything is super responsive -- Firefox, LibreOffice, Topaz Gigapixel AI (wine UI is a bit sticky, but GPU acceleration works!), Steam games (Lichdom Battlemage [CryEngine], Age of Empires DE, Doom Eternal), D3, D2R, Plasma desktop. Played D2R all weekend at 144fps at max settings and not a single crash, unlike with EGLStreams. I proclaim that Wayland gaming on NVidia is finally here, after 13 arduous long years!