You can add another node of Chromatic Adaptation between CST and Grade, which will work(but you need to figure out the difference between different chromatic adaptation algorithm). So the better approach for you might be @nick 's approach: transform to LogC/AWG and use the ALEXA IDT.
The math behind this is: transform the mismatch colorspace and gamma setting into a combination that fits an existing IDT. And the Resolve CST ofx is doing a great job. And besides that, AWG is using the D65 whitepoint and it’s the same as rec.2020(f-gmaut) so there is no need for chromatic adaptation.
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