I also tried entering
echo "ro.setupwizard.mode=DISABLED" >> /system/build.prop
Weirdly I did get the device to boot last week after installing it, but then it refused to boot again so I tried reinstalling it. I couldn't get it to boot still, so reverted to a Lineage backup. I'm trying again today with the latest build but still no luck!
Is anyone running OmniROM on the Moto G4 Plus? Any tips on other things I can try? Or other ROM suggestions?