Construct 3 now has an "Alpha clamp" effect built-in.
Thanks Ashley, I tested the Alpha Clamp in both C2 and C3 even tho I can produce the same effect with it, the results act a bit different than those of Alpha Threshold, settings such as smoothness and the more noticeable "flat colors" parameter.
Alpha Clamp would definitely be a fallback option, however if Animmaniac could update the Alpha Threshold to C3 that would save a lot of recreation time, myself my whole project is build around the effect.
Thank you for the info :-)