I had the opposite personal situation. I did everything I could to avoid any STEM classes in college. I could not imagine wasting my time on math when there were history and English classes calling my name. I took CLEP tests.and got enough credits to cover math and science. I am now planning to have my son work with his math tutor and take the CLEP so he can spend more time on the subjects he enjoys.
Another option for the OP might be what I had my D do - take science and foreign language at the local community college over the summer. As long as you get a C (or whatever grade the home school deems), you get the credit for the course but it doesn’t go into your GPA. Ironically, because she was so relaxed about it, she got A’s.
Yet another option is to take a course pass fail. D took math and, again, was so relaxed that she wound up with a B, which was better than she had ever done in HS.
She graduated summa cum laude with none of those horrible STEM courses damaging her GPA…