Well, I guess install the unsigned apk and connect your google play store account with it. Follow the instruction on how to install it because you will need root. Good luck. I can do nothing about the other signing options not working; maybe it will be fixed next update; I dont know . Im not the developer of the game. Or play on one device with the mod, then when a new update comes out, the game will remember your progress on that device.I already tried it like this and it doesn't work sadly