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I am afraid NO :) It is already quite challenging to make a robust model and let it work realtime, let alone stand out 20 models. HOWEVER, you could do some processing of the frame, by using simple filters like a naive bayes or a basic color thresholding, ... It can make you destinguish buttons into categories, resulting in only needing to apply some cascades. 2 or 3 cascades might be possible to do realtime with enough processing power.
