Ok, some good news for everyone (with a drawback). It IS possible to use this mod without root but as I said, it might have a drawback).
What you're going to need.
1.This amazing mod that icry4u was kind enough to make.
2.The original APK from APKPURE (you can use the Playstore version but I would suggest keeping the original APK handy in case).
3.LuckyPatcher.
Before we do anything, we need to give the modded version a signature so we can install it. If Icry4u releases a signed version then you can skip the next few steps.
1.Load lucky patcher and in the bottom right choose "Rebuild & Install".
2.Navigate to where the modded version is and choose it.
3.Choose "rebuild"
4.Next choose "Resign with test Signature"
5.Let LP do its work and it'll create a new APK with a test signature in the same directory.
Now first off make sure you have LuckyPatcher installed before going any further. How fast you do all this can affect things so be quick
1.Install the original game and run it. Log in with your google account. Leave the game running and switch back to your homescreen.
2.Load LuckyPatcher. In the bottom right of LuckyPatcher you'll see a button saying "Rebuild & Install". Press this and navigate to where you have the modded version (The one you just signed with a test signature). Run it and say yes to everything that appears after this (uninstall, install etc etc).
3.The original game will be uninstalled, LP will backup the OBB and then install the mod and put the OBB back.
4.Once it's done make sure you run the game straight away, log in to your google account when it asks.
5.You should now be running the modded version and it also uses your google account.
Now what's the drawback?
It's EXTREMELY likely that you'll eventually get kicked out of your google play account and won't be able to log in while using the mod. If this happens just reinstall the original and go through these steps again. This hasn't happened to me yet but I'm expecting it will. While this isn't a perfect solution it at least allows everyone to be able to use this awesome mod. I've been sitting on this trick for a while and I've never seen it anywhere else on the internet, it's likely once Google find out about it then it'll be patched but hell, I decided that AndroidRepublic has given me so much fun with their mods over the years that I'd give something back.
Have fun everyone and long live AR!
MAJOR thanks to @icry4u for making such an amazing mod and also being such a great person and BIG thanks to all the hard working staff at AR for making this the best android modding site on the whole damn internet

Icry4u, if you want to use this post feel free to use it in part or in whole anywhere you want buddy! I hope I made this tutorial clear enough. I would have made a video but I think it would be a lot of work when this is actually a pretty simple thing to do.