Any code + PolyLoader = UD forever?

I am writing my own external triggerbot by using the winapi functions to read memory and sendinput to initiate a click. In my understanding, this is easily detectable by VAC since this code was probably written in hundreds of ways and all of them are probably now detected. Given that I am not pasting anything, will PolyLoader make my exe UD? Or will VAC not even detect my cheat if I just write it from scratch? Or should I just go kernel mode?

there is no UD forever

if you using cheat , you already have risk of ban