Interval based blink with Animation Controller alongside Timeline?

I can't seem to get sub animations like a blink to play alongside and override an animator animation.

I guess i could apply an avatar mask, but then i lose any facial animations i added specifically for that animation.

What can i do about this if i want my usual animation in a timeline, but also random blinks during it or other animations?

 

I have a main animation in Timeline playing that has facial expressions and occasionally had looping animations.

I also have a blink animation in the Animator that plays by trigger between a random range. But the blink does not work while the timeline based animation is playing.