We don't think there's a way. Theoretically, you can skip the countdown if you are in the car because you are actually in the car and know nobody else is about to use it. When installing remotely, you don't know if another driver is about to use the car so it sends a notification to all devices on the account and gives others the two minute warning. If someone is in the car or on their device, they can abort the install, if necessary.
And if you are not on the car why does the 2 minutes faster matter.bnot like the update install times are accurate and you can plan to leave at 7:45 instead of 7:47 if you had just been able to skip the countdown remotely.