Here’s the problem in my Eyes.
“Input Broadcasting Software”
There is no such thing. Blizzard made this term up. It means whatever they want it to mean.
They didn’t say “KVM software” they didn’t Say “Virtual Boxes, with Virtual KVMs” they didn’t say “Auto Hotkey” they didn’t say “Input Cloning”.
They didn’t use an actual term, that has any reference to any existing product or way of doing it.
Knowing first hand sadly, of Blizzards “Ban first ask questions later, and then refuse to ask or answer any questions later” policy.
I think its honestly going to come down to how fast the actions present. If it appears inhuman, and you get reported your going to get banned.
Razer has got wise to Game companies banning for this type of stuff, and so have other companies surely. Where you could likely pull of a window of delay, that is varying and within the confines of human reaction times.
However your still just trying to be sly and side skirt the rules, which might still land you a ban.
I would personally guess, this is going to come down to you being reported. If your not reported there is no concern. The warden might watch for blatant cases, but reports will still be prevalent.
Another words. In my personal opinion, knowing how blizz handles skirting the rules, all too well. I would approach it as there is a strong possibility of being banned however you try to do it, and only continue with that in mind.