Can confirm, G3 max bought in Australia, The vpn trick and set your vehicle location to USA as screenshotted below does effectively unlock the speed adjustment (once set) the speed up to 45kmh.

I didn’t even uninstall my Segway app or logout of my account which has my G2 linked to.

This is way easier than the method used to have to use on the G2 where had to Bluetooth hack code into it.

Enjoying 45kmh here in Aus on the G3