Maintain SRGB brand colors in ACES workflow

Hey everyone,

I am combining several color spaces (sRGB + AcesCG) together in an OCIO color managed project. The sRGB colors must be maintained since those are brand colors and the client is very meticulous.
When I use the OCIO transform (Generic sRGB -> AcesCG) the colors are slightly different from when I use sRGB as working color space. The reds are a little too saturated, the blues a little too less.

What is the right way here to both use AcesCG properly and maintain the original brand colors? Manually trying to fix the colors? Render Aces-Footage in sRGB and comp together afterwards? Both of those options are not very practical imho.

Thanks!