Would he have any interest in an HBCU? They do very well in medical/dental admissions. You’re about halfway between Howard and Morehouse, geographically. Howard is quite selective, with a 30-ish% acceptance rate, but they’re more forgiving on stats than comparably-prestigious PWI’s. (ED acceptance rate is over 60% fwiw) With both a med school and a dental school on site, plus all of the other opportunities in the DC area, it could be great for his goals. They’re also need-aware, which would be an advantage in your case since his tuition benefit dollars wouldn’t come from their financial aid budget.
(There’s also NC A&T, in-state, which is not in the reach category, but is very strong in STEM and not as daunting in size as UNC or NCSU, and ticks the “close to home” box.)
Northeastern might be bigger than he prefers, but the alternate-entry programs also have the advantage of a smaller cohort than transitions to the main campus together.
If he likes the idea of CMU, it does seem like a good fit in terms of STEM-focus, size, de-emphasizing freshman grades, and less-terrifying acceptance rates for the Mellon College of Science (although 22% is still pretty low) vs. the CS school (7%). They’re also DIII for sports, if soccer recruitment were a possibility. (So is CWRU.)
If you like Richmond, how do you feel about W&M? Smaller size, strong math & sciences, and they do have both ED1 and ED2. (Also a higher acceptance rate for men than women)