Where are you located? I live in Orange County, CA and having consulted with Vietnamese sources in the know... nothing in Little Saigon that I can find. I put the Q out on Facebook too, no results. I finally found one family owned place in Newport Beach that doesn't use MSG, but that's about it.
I don't go out for pho anymore though, as much as I love the flavor I can't justify the cost for some broth I can't get full on when I skip the majority volume of noodles, etc.
Your next best bet is to check Yelp reviews of Pho places. Often there are MSG-sensitive reviewers who will mention if they think MSG was used based on whether they get the predictable after effects. Then visit the place and to double check, also ask the server before you order pho.