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As for my first question: Yes, the same matrix is used to convert internally to RGB and then to convert the output to YUV444P16. So, for example, to use a shader that converts from BT.2020 to BT.709, you'd set matrix = 4, set the props of the primaries of the output to BT709, and add something like this:
clip = core.resize.Bicubic(clip, format = vs.YUV420P8, matrix_s = "709")
As for my other questions, I can't think of any simple way to test this, but I'd actually be surprised if it even worked with placebo.Tonemap.
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