

Those are open questions that I don’t think we can answer yet.
If you are asking if Valve did make changes there, I’m expecting the answer is likely no. They haven’t shown anything regarding KDE/desktop mode on the Steam Frame. And we have yet to see how exactly this is integrated with gamescope. But if the device does become popular and interest grows for Linux VR development, then I expect we’ll see people trying to make new VR environments for Linux (or adapt existing ones for VR).
However, given that Valve plans to offer ways to play non-VR games with the Frame, I expect one could add a nested wayland session as if it were a non-Steam non-VR game, so in the VR environment from SteamOS one could have a floating screen showing a traditional KDE session relatively easy, I would expect. And in that sense one could have a desktop VR environment standalone, in the Frame.
Many Keepass clients have support for not actually deleting entries, and instead moving them to a “Trash” subgroup inside the kdb that is ignored when searching entries. Also they usually keep track of the history of changes to each entry, to make it non-destructive.
Coupled with Syncthing typically automatically creating backups whenever it encounters conflicting changes, I feel this should be enough, at least for me personally.