Doing some research and as per user messi2050 (the maintainer for TWRP for LG Stylo 3+) has said on XDA forums that the Q710WA doesn’t support unlocking the boot loader without an “unlock.bin” directly from LG.
Looks like the Stylo is out. Gonna keep researching for the G4.
Worst case I may try to trade in these phones and get an old pixel or similar phone that has a verified working degoogled OS.
Personally if it's a disposable old phone i'd at least try flashing divestos for h811 or h815 and see how it runs (seems the difference between 810, 811, 815 is just original carriers vs international variant).
Then again it depends how willing you are to tinker with trial and error.
For a pixel, can try paying attention when they announce or release the 8A, the 6s and 7s might go on sale (especially 6a 7a).
I'll let you know if I sell my 6a :P
