Chris! That is super helpful, thank you.
That being said, how do you feel about this workflow: nest my full 2k (2944 x 2160) clips into a 1920 x 803 sequence, and lay all my graphics and effects etc. into that sequence. Then export out at 1920 x 1080, and scale to fit so that we maintain the widescreen look with the proper 2.39 letterbox.