I've looked into EndeavourOS now, and I'm very confused. Normally I'd download a .iso and burn it onto a USB using Balena Etcher (or Rufus), but the official page for EndeavourOS doesn't have a .iso. I tried following "method three" on that article, but I don't understand the dialog asking me to choose between Raspberry Pi, Odroid, and Pinebook. I don't have any of those. I just have my own desktop PC with its Intel CPU. Also I see "ARM" everywhere and I think that also implies incompatibility because ARM is RISC whereas my 6th-gen Intel is CISC.
We have the same exact requirements, which is a first. No Ubuntu, must play nice with Nvidia GPU, KDE is nice, basically your entire list of preferences. I'm glad you posted, for one.
Good to know, thanks!