Endeavour IS is arch with KDE and a few basic apps. Pretty sure you dont need WiFi to test it. For any issues you can just use the arch wiki. I really enjoyed it as first distro as the wiki is so helpful. I moved to Mint tho (not DE) and have loved not having to use the terminal for anything.
You can use Syncthing (the fork on FDroid is better) and Obsidian (for the notes). You can also use obsidian services (might be paid) for the sync but its easy enough to do yourself.