Can you move your Chosen Champion to the main deck during sideboarding and choose a new Chosen Champion from the sideboard without directly swapping them?

Ruling: Yes, you can move your Chosen Champion to the main deck, side out any card from your main deck, and choose a new Chosen Champion from your sideboard. You do not have to directly swap your Chosen Champion for another.

Nuances:

• The only requirement is that you end up with exactly 39 cards in your main deck and 1 Chosen Champion.