After a refresh of LineageOS 18.1 customROM in mid-April 2023, @Awesometic (XDA Senior Member) has now integrated signature spoofing support into the LTE and Wifi-only models with the latest LOS 18.1 build May 10, 2023. This opens the door for a problem-free microG implementation. Even OTA update is now available for the gts3lwifi model.
#Sources: Device Tree, Kernel, Vendor: