Hmmm. Soo.....How long does it take for the dream to form? is it like a WILD, where you go directly (well not exactly directly) from conscious awake to conscious asleep? Cause that would be pretty hard with no REM cycle in progress. Or is it more of a DILD type thing, where you depend on working with your subconscious to increase the likelihood of an LD? It really is quite unclear when you get to the part of what you do as you fall asleep.
Still, it is an interesting idea, and if it works for you, all the power to you.