Hello,
the nVidia driver will soon be updated to major version 550 after successful tests, I hope the upgrade will be smooth for you too.

As for the dual GPU + display support, I don't know how to provide a out-of-the-box solution working with proprietary drivers and every situation. By the way documentation on configuring Optimus and PRIME support might be helpful. openmamba provides packages like bumblebee and envycontrol which might be helpful. I see now there is a tool called optimus-manager which maight be worth packaging.

References:

https://wiki.archlinux.org/title/PRIME

https://github.com/Askannz/optimus-manager