So really annoying but I think I figured out a solution to my problem. In case others have problems getting the installer to start or booting to desktop after installing this is what I did:
Hardware: 14900KF, DDR5 32GB (reduced to 16 for this), 4080 TI
Installer - I added these to the grub loader on the linux line:
acpi=off modprobe.blacklist=nvidia,nvidia_drm,nvidia_modeset,nvidia_uvm
That got me to the installer, at which point I managed to install on my NVME and reboot. When rebooting it would auto kick me to a terminal where i could login to a terminal bazzite (simple desktop experience is what is called) that i couldn't startx from.
At this point I ran sudo rpm-ostree kargs (which SHOULD match your GRUB changed) but it didnt. All my test updates weren't getting through. That's why I noticed things like nvidia still starting despite me blacklisting it.
So to apply the boot commands i needed i had to run these in the bazzite terminal:
sudo rpm-ostree kargs \
--delete='acpi=off' \
--delete='modprobe.blacklist=nvidia,nvidia_drm,nvidia_modeset,nvidia_uvm' \
sudo rpm-ostree kargs --append='nvidia_drm.modeset=1'
So that acpi is back on and can find the nvidia GPU properly and specifically target the GPU flags. Why i had to disable acpi for the installer but NOT the desktop is anyone's guess.
(Unsure if this helped but I removed 1 of my 2 DDR5 ram sticks before troubleshooting. I noticed slightly different behavior so if above doesnt work try that)