I have similar laptop currently and I have it set up exactly as you want. I'm on Void Linux with KDE Wayland, but I was using Fedora few months ago and I remember it working correctly too. Wayland uses integrated GPU by default, so in case I want some program to use dedicated GPU, there's handy script to do that (it just sets few env variables).

I think it should be quite easy to set X with i3 to use integrated GPU, just like Wayland does.

I prefer nvidia-xrun over PRIME

nvidia-xrun wiki article

PRIME wiki article

I'm not entirely sure, but that would mean that the laptop's display would have to be connected to both the integrated graphics unit and the dedicated graphics chip. I suspect that this will not be the case with most laptops.

Have had reasonable success with similar hardware

https://wefwef.app/profile/midwest.social/c/linux@lemmy.ml/comments/1266950

I have the intel/nvidia 2080q on my lenovo 17inch legion. Nvidia works on my Nixos with wayland/hyprland. Using both as well to save batter just have to activate nvidia prime with a command.