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Another possibility: if you own any computer and any tablet, they can act as an external screen. That has been around for years before apple sherlocked it.

I do have an Android tablet mostly sitting and a Linux laptop (running KDE) can I do it in a really seemless way?

Only through apps that work as RDP/remote desktop. You can't use native X/wayland screens with Android unless you root it.

will check it out

I use Deskreen with Windows, it has a Linux version that probably works similarly. I think it leverages browser streaming tech.

https://deskreen.com/

Easiest way to get it working is with a dummy plug (because it just casts displays, it can't create one), but maybe there's more options on Linux to fake a display in software.

Will check it out

Another possibility. Get a Quest Pro VR headset.

There are apps like Duet and a number of others for Win use as well.

also good with luna display