Hi! I’m a senior at a school almost exactly like this. No APs or DEs in anything until Junior year, and only 3 honors classes in 8th-10th (Alg 1, Geometry, Alg 2). Trust me, I know how frustrating this can be. Because of your limited opportunities, it is even more important to take advantage of each one; however, don’t give up something you love and are good at for an AP. If you love orchestra and you’re good at it, I would consider sticking with that class. Although it is easy to try to pick classes based on what colleges want, choose classes that interest you, and you are passionate about. This will result in better grades and a better high school experience. Colleges will accept you with or without an extra AP. Good luck 
P.S. Don’t worry about schools judging you based on your lack of AP courses. They will look at your application in the context of your school! If you only had 1 AP offered, they will understand that.