[RMVX ACE] ADDING SUBTLE MOTION TO FACE SPRITES?

So, I know there's a non-script way to create effects with face sprites, using the "show picture" event command and moving said picture a little, or by using a script and doing it frame by frame, but that would be really time-consuming in my situation, especially with how my project is laid out.

I'm looking for a script, or for someone to help me out with creating one that adds subtle motion to face sprites, i.e., maybe just slightly wiggling or moving left and right side to side. I can't name many games, for example, that do this, but In Hotline Miami, the characters face rotates a small bit in cutscenes? Can anyone help or suggest a script to replicate that kind of effect?

Example: