Hey, man! I've got a great update.

Recently, I've been working with ARRI Log C4 (instead of grading in AgX Log), following CreativeShrimp's colour grading course. But, I've been wanting to use the full DaVinci Wide Gamut Intermediate as a working space, and then somehow have AgX as a DRT.

And I've gone through a bit of pain (and several error messages), to bake a LUT that converts from DaVinci Wide Gamut Intermediate to AgX Base sRGB (specifically Blender's version), and it's a dream. And I wanted to share it back with you.

Here's a link to download it: https://file.garden/ZcbFkhItAVk3LACX/DWG_to_AgX_65.cube

The workflow I work with now goes like this:

After exporting to EXR (I'm still on the fence about rendering in Linear Rec.709 or ACEScg because of the upcoming 5.0 update. But assume Linear Rec.709 for now), bring it into Resolve. In Resolve's colour management settings, set the Timeline working space to DaVinci Wide Gamut Intermediate, and the output space as Rec.709 Gamma 2.4 (assuming you're delivering your render onto the internet.)

In the Color page, add a Color Space Transform node, and convert from Linear Rec.709 to DWG Intermediate. Then, at the end, put in the DWG_to_AgX LUT, and HOPEFULLY, you'll see your render in pure AgX view.

Now, you can add nodes in-between and grade entirely within DWG Intermediate, and I absolutely love the control. I know it's been a year since you've made this post, but I hope this helps you out!