I did it through SA. I asked two SA and they gave conflicting info. Took the gamble because I can’t wait until Dec 2022. Turned out well.Congrats. I'm thinking of doing the same as soon as I'm back from vacation in July. Don't want to do it right before I leave in case I get a really quick VIN and can't be here to take delivery. I think with a March 11th order I will get a fairly quick VIN...maybe not same day like your December order but within a few weeks.
Did you make the switch yourself online or through an SA? Did the SA say you may be treated as a new order and go back of the line or were they knowledgable enough to know the switch isn't treated like a new order as far as EDD is concerned?
On delivery day, there were 6 MYP. Only 1 MYLR. Tesla playing games.