Sorry I don’t own one. I mainly build them so I have the option to sell them from my personal business, https://openmobile.us/
There are some users of my builds though, you may be able to check with them on the unofficial pixel builds thread
I do have intention to look at bootloader relocking eventually… Vincent noted that it shouldn’t require user instead of userdebug builds? But honestly I haven’t tried any of it yet. Sorry I am yet to digest the info on iodé - signed build · Issue #786 · lineageos4microg/docker-lineage-cicd · GitHub that you have contributed or give any feedback there.
One more comment: I did get this feedback from a user about how to relock that I also need to make time to digest and possibly try, do you know of it?