crt_deck
This app is specifically meant for switching between the normal default Steam deck resolution and 480p and is to be used for games and apps that can work in a window, along side KWin rules.
I use this with my 15kHz Sony PVM monitor.
Pull requests are welcome.
As this software is totally open source you can, swap out the resolutions with whatever you want.
Usage:
chmod +x crt_deck
./crt_deck