We see fans (granted, mostly in higher levels, college, NBA; but some in high school) trying to distract free throw shooters all the time, without any repercussions. What makes this situation so special? Because the offender was a member of the opponent's other gender team?
Technical foul is a nuclear option. Rules really don't allow us to give a replacement free throw. We're stuck.
2-3, although not technically relevant, seems the most appropriate way to approach this matter.
Maybe it's one of those "sometimes we just have to officiate" situations.
Maybe we just ask the site director to keep fans away from the endline during free throws, and move on.