Is downloading any kind of DLC these days really all that difficult though?
I don't really understand why, in your plan, the "DLC" has to be on the disc.
(As an aside, I don't really find entering DLC codes to be all that tedious but I may be inured to that from entering hundreds of gameshark codes with a gamepad. It really shouldn't take more than 20 seconds at most to enter a code.)