Is this option to use https://androidmtk.com/use-rsd-lite-tool still closed to you ? and are you somewhat familiar with it ? Is fastboot mode still inaccessible ?
This link is not very reassuring; I don’t think you are in the same situation, but I think worth reading as I think it will include useful links. I suggest that you continue to tread lightly.
As @Awilen found Moto devices seem not well documented if the device goes to EDL.
I am adding this as reading material maybe there is a way within /e/OS, idk, might also be worth to Report an issue, mentioned above. I guess this would depend on how confident you were that the device was fully up to date when you acquired it.