For context, I've already flashed LineageOS on it about a year ago. I just wanted to see if I can get around the limitation of not being able to use PayPal via Google Wallet, for some reason it refuses to add it on that phone since the day I switched it to LineageOS.

Thanks for the tip, I'll try my luck with Reddit.

If LineageOS has Magisk (I'm assuming it doesn't), you can use MagiskHide (it's an option in the settings, maybe called something else now) to make Wallet think everything is fine. You may also need to spoof your phone's ID, there's a package for Magisk that will do that.