I wished for the same thing, but because the image sensor is not square, the only options would be to not use all the the available image, or to distort the image aspect ratio. Neither of these is acceptable in my opinion.
What is really needed is some way to change the physical orientation of the camera. Something that the current mount doesn’t allow, as you have stated.
Something like https://www.wyzecam.com/forums/topic/mounting-options/#post-72308 would allow you to convert the vertical serface to horizontal. I don’t have any great suggestions, but I don’t see how doing a 90 degree rotation of a non-square image would turn out the way you would want it to.
Here is a post with a picture of the v1 and v2 image sensors on the circuit boards.