I windmill it in. But, you didn't give that option.
You are over thinking this. If #3 is what you are comfortable with, don't worry about it. You are trying to get swings in for the girls. For about 20 years, the only net that I had, would just allow me to toss overhand. No women or children ever had their softball career ruined by swinging at a ball tossed overhand.
Glad to hear you say that. My daughter takes lessons from an old baseball player. He throws baseballs overhand at her, usually while sitting.