Two GPUs, after install and reboot, black screen

Tried bluefin-dx-nvidia last night, installing on a fast usb drive to try things out again.
I have an Intel Arch A380 that my monitors are connected to, and an Nvidia RTX A4500 that is for CUDA only (no monitors).
After installing, I got a black screen when I rebooted. I also tried Silverblue thinking I could rebase, but same issue. The Fedora installer kernel panicked.
I realize this is an edge case, but hope someone might have suggestions.

Here’s my current setup:

OS: EndeavourOS Linux x86_64 
Kernel: 6.6.22-1-lts 
Uptime: 13 hours, 54 mins 
Packages: 1227 (pacman), 46 (flatpak) 
Shell: zsh 5.9 
Resolution: 3840x2160, 2560x2880, 3840x2160 
DE: GNOME 45.5 
WM: Mutter 
WM Theme: Adwaita 
Theme: Adwaita [GTK2/3] 
Icons: Qogir [GTK2/3] 
Terminal: kitty 
CPU: 13th Gen Intel i9-13900K (32) @ 5.500GHz 
GPU: Intel DG2 [Arc A380] 
Memory: 6755MiB / 128507MiB