Proper Adobe RGB to Rec. 709 workflow?

I’m on a project where retouched still images are being supplied in the Adobe RGB (1998) color space. It’s too late to ask the retouchers to work in a different color space because the images have been already approved by creative team.

I am now using those images in AE to layer with animations. Upon import the images look different than viewing in Finder/Preview. Color and gamma are off. I tried different combinations of changing the Interpret settings per image as well as Display Color Management but nothing looks correct. I would like these videos to be in the Rec. 709 space so what workflow should I be using to get accurate color from the still images in my final renders (H.264) ? Is there an Adobe RGB to Rec. 709 LUT I can use?

I can post examples tomorrow when I’m back online if that will help.

Thanks!