New rears is probably the only way of fixing the noise - its just a Mk7 Golf thing.
The rear of a Mk7 hatch is super light, you won't use up the tyres before the saw tooth gets them.
Just swap them out... or if you want to be totally @nal about it.... when you front tyres are shot, get new ones and stick them on the rear. Move the rears to the front.
Putting the newest rubber on the rear isn't actually such a bad idea anyway.
I was getting about 14k from the fronts and as I said, the rears more like 60k. Rotating the tyres like I suggest will mean you'll never develop the drone.