I wouldn't use broadcasting and instead I would make a key similar to the targeted AoE keybind template in isboxer along with with that sync camera positioning macro as the first action(make the keybind something very easy to press). This key doesn't fire anything in wow but gives you a mouse cursor until next click.

I forget the macro off the top of my head but its something like /script SetView(4);SetView(4)

I use ctrl + F as my key to toggle this keybind in isboxer. Its easy to hit but not easy to accidentally hit. Its also good for fixing slave interaction as a result of target AoE that didnt fire all the way. Such as when I try to death and decay but instead of getting the ground it targets something else like my toon or an NPC instead or I can't drop it due to some weird terrain angle.

Maybe get fancy with it and have it disable and enable CTM in actions or steps.