Hi @jakfrost,
Thanks for responding. I spent the entire last 3 days figuring out just that - how can I manipulate the grub from the live-cd. I tried modifying grub.cfg in the efi, I tried chroot and some other things but the ostree setup was too complicated for me. Finally, I just gave up - keep the fight for another day when I learn some more about these things. The other thing in my mind is to try getting silverblue with btrfs to work. Again, it currently involves modifying grub kernel command parameters that I am not sure how to do yet.