I went through this process today, but SetupWizard still tries to do a system update before letting me get to anything. There's probably already an official update newer than the one the script automatically installs. I cut the internet connection before it could finish the system update, but I'm pretty much stuck until I can figure out how to bypass that. At the moment I cannot enable OEM unlocking or ADB, since I have no way to get to the Settings app.
Since I'm on sabrina and the included LineageOS 19.1 recovery image isn't working, I flashed the 18.1 recovery image and it works fine. Although, it's a bit annoying to get into recovery mode, since I have to re-run the exploit every time just to get into fastboot and then boot to recovery, since I can't actually access the setting to enable ADB (is there a button combo or something to get into the Lineage recovery without attempting a factory reset every time? That would be nice).
I can access an ADB shell from the Lineage 18.1 recovery, but I'm hesitant to install Lineage 18.1 without properly unlocking the bootloader first (fastboot oem unlock fails), which I can't do without access to the Settings app.
Since I have root shell access from recovery, can I just disable SetupWizard from there, or enable ADB from there so I can spawn the Settings activity manually?