package-update-indicator which I assume is what the Bullseye version is using, is actually rather neat.
You can use it along with unattended-updates to download packages in the background. Then you can run sudo apt upgrade whenever you feel like it.
Pi 4 4GB will work. Just need OBS Studio.
You can either build it from the github or use pi-apps to install it.
Here is what I have added to mine: Edited: Removed thef***
# Midnight Commander
# Fix for my messed up PATH