lol, thats fair enough fella.
I have an issue I am investigating at the moment on my car with the cluster. Its lit up like a christmas tree 24/7. I drive the car all week to work, so the battery always gets a good topup, but I have left it for 4 days straight without touching it, the light was on, I had other LED's on (12v extension lead, with my parking sensors plugged into it) along with an OBDII connector plugged in and lighting up its own LED, as well as the usual immobiliser. Never had an issue starting it.
If you do want it without the radio, I really wouldnt worry about the battery being killed off by it. Look at it this way. The garage wont have disconnected the battery for you, so it will be sat there now with the cluster on, I doubt they will have any problems.