To expand on Nigel's remarks, IR remote signaling and I2C are really not interchangeable things. An IR transmitter (the Remote Control) is a "spray and pray" device. It sends a signal out into the ether hoping there is a receiver within range that can receive an act upon those signals. There is no confirmation, there is no feedback, there is no guarantee of reliable delivery.
I2C on the other hand is a two way data exchange protocol. It uses the Master/Slave paradigm in which a master device knows about the existance of, and the network address of, and the data echange format of, each of the devices on its network. There is no methodology that I'm aware of that would allow a foreign node to be attached to an I2C bus and be plug and play.
It is conceivable that you could implement a device that would function as a second master, but that opens up a whole host of problems that I'm quite sure you are unprepared to deal with.