Oral trenbolone should not be an option, it's faked too often and is too harsh on the liver. Trust me. Why don't you drop the tren idea? Go with anavar/winstrol/tbol with n2guard.
Let me put it this way - the probability of you getting a fake oral tren or messing up your liver is higher than that of getting tren cough when used with Cardarine. It is that simple. Anyway - tren cough is not dangerous - just unpleasant, and it does not happen all the time to all the people - it is just a possible side effect.