I don't think there is, BUT, before he goes down that rabbit hole, he needs to investigate if his medical issues are waiverable. DoDMERB DQs, commissioning sources waive.
I have a cousin that did not receive a waiver, but he works for the Army as a GS. Was even stationed in Peru for a few years and is now up for the opportunity to move again if he so chooses.
~ Caveat: His degree and the university from which he obtained his degree probably were a factor. He went to Georgetown. Interned on the Hill for a Senator for 2-3 years as a college student. That parlayed into getting his GS position.
They could also look into degrees where defense contractors hire. I have another cousin that works for Booze Allen, she has/had no desire to serve in the military, but her job is closely tied to the DoD.
Lockheed, Boeing, Pratt and Whitney, Rand,and Raytheon all come quickly to mind for career opportunities that support the military.
Finally, I would also say look into the State Department. I get he is not in college, but if he knows without a doubt he cannot get a waiver, it is an option.
~ Bullet as an O4 went to what is called PME (Professional Military Education). I recall that there were other students that were civilians from the State Department. This school is the military's Masters degree. It is a one year assignment and your job is to be a student.
I would say do ROTC as long as it does not impact his grades. It is something that when he graduates may have an impact on job opportunities.
~ Another caveat: I live in No.VA and many employers are DoD related. Understanding, even a very small aspect of the military may give them an edge.