User friendly and immutable? I don't see one just yet

I know some Linux types scoff at user friendlieness, but plenty of us don't, let me get that out of the way. Anyway, I've been looking at the immutable distros out there because later Win10 and WIn11 are disgusting me so much I want to get my less technical family off of them. Problem is, I'm not sure there's a terribly good landing spot. I figure if I give them something immutable it'll be a lot harder for them to break, right? Especially clicking on pop-ups, you know how it goes.

Obviously the big one out there is Fedora Silverblue...two problems with it though. One, it's GNOME, which isn't all that Windows-like. I like it personally but it might be harder for someone coming from Windows, learning-curve wise, and the idea is to NOT frustrate people back over to Windows. Kinoite might work out better, but then we get to the second problem: Fedora is religious about offering free software only. So certain codecs and such are missing. That won't do.

VanillaOS is up and coming and seems more relaxed...but again, GNOME.

I'd like to see a more relaxed option out there that uses KDE, or maybe Cinnamon, and I'm wondering why none have popped up yet. I do think if Linux desktops are going to get anywhere it's going to be a situation where you give them a read-only system and let them use Flatpaks. Of course, if nothing's out there I might just have to give them an Endeavour or Mint setup without sudo access, but then they wouldn't be able to update the system, so that's not really a fix.

This has been turning around in my head for a while and I just wanted to put it out there. I think there's room for more (and more diverse) immutable offerings out there.