I don't want to change the host is but I want to modify things like changing the desktop environment to plasma mobile. Issue is with current os arrangement there isn't like a login screen where u can select upon multiple options of installed desktops and I know if I installed sddm this would more than likely work but not sure how this would come out with current config
If you do this today the options what might work somewhat are Ubuntu Touch and SailfishOS. Plasma Mobile, Gnome, SXMO etc. does not work without extra effort. For example sxmo should work if you use this branch of sway https://github.com/FakeShell/sway
And also currently the only officially supported de is Phosh. You might also find interesting to read about Phrog 🙂
You could flash a sd card with FuriOS, or something else, insert it and use dual boot to have a playground for those things. It would be mad cool if you would share if it works or not. 🙂 https://furilabs.com/flash-guide/