Clearing something in advance:
"Jotunbrud:
Benefit: Whenever you receive a modifier based on your size on an opposed roll (such as during grapple and bull rush attempts), you are treated as Large if that's advantageous to you."
Intimidate would count as an opposed roll, correct? And there is a size bonus for being larger, IIRC. And being treated as Large would be beneficial for the roll. Would this work?