If you’re US based there are exams like CLEP you can take for a small amount of money to gain credit in a lot of prerequisite general education courses.

If you’re referring to exams like admission material, you may be able to string arm your way in with enough money, but my experience is that the bureaucracy is very strong with these institutions and they are simply not designed for people like you.

Also finding a program that offers online physics courses may be a challenge. I’ve only ever seen one from the OU, mentioned elsewhere on this thread. Most online programs seem to either be CA, a handful of humanities degrees and what I’ll call “bullshit degrees”.