The answer is sooooo aircraft dependant that there is no one solution fits all. Some of those three work on some aircraft, some of them dont work at all. For example, you cannot reduce throttle incrementally on some aircraft (EC120, AS350B3, and even 206 is hard) with enough finess, other sircraft still have enough T/R thrust at low NR to nulllify the technique (light weight B212 for example) and others are complicated by mixing unit interference dependant upon what the malfunction is and where in the control system it jammed.
Aircraft specific I'm afraid.