Combining EXR Blender exports and 2D motion graphics - what color space should I use?

Hi folks. I've been trying to get multilayer Blender EXR's to work with AE. Previously I had set the color space to linear, but the gamma was still off.  I followed Alex Weinburg's tutorial for using ExtractR and OpenColorIO to get Blender's native "Filmic" space displaying the proper gamma. https://www.youtube.com/watch?v=4P2j1hzD8I8. Cool! Sweet! now my renders match my Blender viewport without a bunch of annoying color grading and gamma shifting. The alpha channel for a multilayer EXR from blender still does not work with AE due to premultiplication - but that is a different post... The above workflow also entails turning OFF linearize color in the project settings.

I designed all my motion graphics with this option enabled - now my colors and transparencies are all off. My questions is - was I just dumb for designing 2D motion elements with a linear color space? Is this even necessary for 2D work? The benefit of AE is that I can do VFX compositing and 2D motion graphics in the same program, same project. I am still wrapping my head around the nitty gritty of color spaces as applied to my render engine as opposed to coming from a camera, so any tips would be greatly appreciated. Thanks!