I haven't specifically pursued that idea as a way around the problem. I HAVE done enough reading about this problem over the years to be reasonably confident that it won't work. California is really good about making sure everybody pays their taxes. I figure if it were a way to get around the problem, then I'd have seen that in some of the previous reading I've done about this problem, and Tesla would at least mention it as a mechanism for people interested in the factory delivery + factory tour experience.
To get around the problem (and this affects way more than just Tesla), the solution looks like "ship the car out of state and deliver it there - that's how you avoid California sales tax". Dealerships face this problem also - if you buy a used car from a California dealer but live out of state, if you fly there to take delivery of your used car, the dealership will collect California Use Tax.
Crazy, I know. And Tesla is starting to deliver a lot of cars. You'd think the state would like families to come visit, and spend a few days or weeks driving around being tourists in their new car - at least some of which is guaranteed to happen in California. And ESPECIALLY families that think spending $50k, $100k, or even $150k on a car isn't supremely ridiculous.
With the right setup, I can readily imagine Tesla getting a cottage industry going for International customers flying over to California to take delivery, drive their car around for a few weeks touring the States, then give it back for shipping to their home country. I know the manufacturers in Germany that kind of program going, and I've never ready anything about good stuff about those trips (fly to Germany, pick up your new BMW, drive it on the Autobahn and around Europe, then fly home and have it delivered to your house at home). Yeah