I got a response from a Fisker advisor (or whatever it is in Danish) on whether or not I can change one of my non-refundable-fee pre-orders from the Ultra to the Extreme. The response was that I can't change the trim on the locked non-refundable pre-orders. It also said that the preorders for the Extreme and for the Ultra will reopen on November 18th, 2022, at which time I can place a pre-order for the Extreme. To me it sounded like the existing locked non-refundable-deposit pre-orders are already queued up for production, and those who didn't convert their earlier reservations to the non-refundable pre-orders are not part of this queue. If I hadn't converted one or both of my refundable-deposit reservations to a non-refundable-deposit pre-order, I would have been able to use that reservation to choose the trim, but only starting on November 18th. Because I converted to the non-refundable-deposit pre-order, neither one of my Ultra pre-orders can be converted to the Extreme, so I would have to make another deposit to reserve the Extreme if I wanted it.
Here's hoping that my Ultra pre-orders (reserved on January 1, 2022 and January 3, 2022) will be delivered in mid 2023.