I love Stonewall - IMHO, it’s just too far to make it worth it. You’d be better off going to Glen Mills (particularly if you went to Swarthmore)
Also, if you head down the Swarthmore path, there is Rolling Green Golf Club in Springfield PA. I think people in Philly know how good a course it is, but it suffers from being a bit away from the Main Line and is in a part of Delaware County that while a nice town, it doesn’t necessarily have the big dollars that Merion, et. al Country have. I hate to call it a hidden gem, but might be the closest thing to a hidden gem in the Philly burbs. They might be open to your situation - if I recall they have a decent young professional membership category (which maybe you could fit in to).
I absolutely love the course. William Flynn design, great green complexes, interesting holes. Challenging but not brutal