Are there any other outside classes that they will accept? I am in North Carolina and here the state runs the North Carolina Virtual Public School that kids can take classes from online. You can check and see if that would work. I believe they do allow some out of state enrollment. https://ncvps.org/ Some of our schools also offer “credit through demonstrated mastery”. Not sure if that is an option for you.
Otherwise I agree that it sounds like another school might be a better fit.