I knew as soon as I heard about this project what you were going to do. I have taken the bluetooth remote apart before and knew that it was possible. I have done this on other lighting and fan control rf remotes before. Good luck and there are companies standing by that will produce this device for you if you order enough numbers and it sounds like there is a lot of interest in the project so I am not sure what the limit is on cost per unit. You should consider some kind of patent if what you are doing is not frownded upon by Sony. I'm sure if they knew what us CI's are willing to go through, they might decide to make a different remote.

Good luck and get some sleep.