I got it to work! You need to first install Tow-Boot to the Pinebook spi flash (Getting Started | Tow-Boot). I had some issues with this process and found solutions here (doc: Document neutering other platform firmware installs · Issue #47 · Tow-Boot/Tow-Boot · GitHub) and here (No option to flash firmware to SPI on Pinebook Pro · Issue #55 · Tow-Boot/Tow-Boot · GitHub). Once I had Tow-Boot installed I was able to boot from an sd card with the Silverblue installer image and install to the emmc. The installation was super slow and at the end there was an error message related to efi or grub not being configured properly, but when I rebooted Tow-Boot automatically booted to the Silverblue grub menu so it must not have been that big of a problem.
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