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I think this add-on might be what you need: TROIKATRONIX : ISADORA - DX – Rotate Canvas
It uses Matte to create a new canvas at the required 'rotated' dimensions, and then drops the image into this new canvas.
@jaio
If you can find a suitable cube LUT, for converting rec 2020 to rec 709, you could use my 'color grading' shader (TROIKATRONIX : ISADORA - DX – PY – Cube2LUT – ColorGrading).
This should allow you to convert the color, but will not be as true to source as making the conversion in something like Davinci Resolve (my recommended option).
@bonemap
Could you DM me the User Actor and/or patch so I can take a look?