Blue Stoop is based in Philly! https://www.bluestoop.org/
re: rec letters - I agree that you shouldn't go with a professor who's intermittently responding. Do you have the financial resources to take a workshop or two this year? A lot of workshops offer scholarships, too!
A previous instructor of mine told me candidly that rec letters are mostly just vibe checks, though I've heard from folks in Draft that they can make a marked difference, too.
One of my recs was from an instructor who I workshopped with last year, via Zoom (they teach independently & their rec was from a gmail url, which is generally not recommended, but it turned out okay). You can also ask a former manager to be your rec - anyone who can speak to your ability to collaborate and play well with others (ie. skills that translate to being a kind, considerate person in workshop). One of my friends even asked a coworker to write his, and it worked out for him.