DB,
Your concept is not complicated or hard to understand.....quite the contrary in my view....and something that is entirely correct in its design and purpose.
Even on an ILS procedure there is mention of when one may descend below landing minimums predicated upon having certain visual cues in the form of landing aides, lights, and landing thresh hold.....you are doing much the same here with you procedure.
The FDP terminology or anything like that works fine. It is your concept that is the exact right answer no matter what the wording is.