A couple “good” colleges I’ve come across only need “proof of high school graduation” if you’ve complete some college.
Thinking out of the box, I wonder if a letter confirming your graduation - certified by an official at your high school will suffice (if they’re willing to write one)…or even a copy of your HS diploma. Might be worth asking the university’s admission office if they’re willing to accept either (if all they need is proof of high school graduation).