Just be aware that the uninstall script, in trying to be 100% reversible to the service script, resets the permissions on the database file so it can be edited again. So you *may* want to manually set the permissions to 440.Ah good, I'm not crazy!
My thought is that I just tripped some deeper bootloader check in GMS earlier on before I rooted and despite MagiskHide and Play Store wipe getting me passing and certified the only way to clean out the old check was the SQLite hack.
Now that it's working I've removed the module, set up GPay the rest of the way, got all my loyalty cards, etc. back and all is still working, so fingers crossed it'll stay that way.
i.e. the module wasnt meant to be uninstalled after install
Also be very aware that flashing the module with loyalty cards present can lead to loyalty cards being purged (theres a warning during module install)