Well to be honest with you I don't know nationally how many XO chapters participate in No Frills Rush. My University's Panhellenic council thought about it, for all of two minutes, a few years back. But we decided it would hurt our recruitment numbers (as a whole) rather than help. Why you ask? Because at my school, there are four chapters and none of us have houses. Rush is held at the University, on the third floor of the student center in individual rooms. How BORING would it be to have a no frills rush in these student center rooms!!!
To be honest with you, and I can't speak for other organizations, but I don't know a National really that is only about No Frills Rush. I mean, we in Chi Omega have traveling rush committee that will help chapters with numbers, themes, budgeting and so forth.
From my understanding it has to be something your school's panhellenic council will have to decide and vote on
Hope that answers your question!