Reporting back.Zero news. You might have better luck reaching out to the OP about this. I haven't heard anything else about it ever since.
I would also suggest looking into the Nanodroid thread and use the packages there to patch this ROM. If I remember correctly, LineageOS should already have signature spoofing built-in, you just have to flash the microG package and enable it with the right Android 10 permissions using ADB commands. I don't use this ROM so I can't tell you for sure if it'll work, so try it and report back.
Signature spoofing works. I installed microg from F-Ddroid repo.
There is even some control over which apps can use it, so its even reasonably safe.
Nanodroid version is not working properly.
I managed to get everything working and I am satisfied with current state. But there is room for improvement.
Issues that I had.
Sygic navigation is crashing when accessing microg location service
Solution found somewhere on internet :
pm grant com.google.android.gms android.permission.ACCESS_FINE_LOCATION
SELinux not working by default
Simple enabling it with :
su
setenforce 1
works, but it is not persistent. It won't survive reboot. Currently I am setting this automatically with tasker after reboot. I know there is better way I just don't have time right now to explore it.
I am happy for now. Hopefully there will be updates with this ROM.
Offtopic:
Just out of curiosity which rom do you use ?