If I understand your question right, you're wondering about the use of sensory cues to help oneself determine the timing of speech movement onsets. Something like: "when I feel my larynx start to vibrate when speaking the 'B' sound, I will begin lowering my jaw to move my lips apart." I believe these cues can be included in fluency shaping therapy. And then you're asking about moving beyond these sort-of artificial cues, so that speech feels more natural and self-directed? If so, you probably have looked more into this clinical literature than I have. The only therapy I've undergone used a different approach (Stuttering Modification rather than Fluency Shaping), which does not make use of explicit "triggers" at all.