Most likely not legal to invalidate in EU. There is laws that’s say that ev everything you can do manually, you are allowed to automate. Any rules against that is null and void.
The “horse winning race” case is a known one where they go into this.
Geico will cover you. You can disclose ahead of time that you have an aftermarket ADAS if you want. If it drives you off the road, it will be as if you drove off the road and you will be declared at-fault, of course.
