Don't blame Canada. We are ignorant. We don't understand how stuff is affected by the things we do.
You don't make sense.
I think you want to convert the mic input on your IR transmitter to line input so you can connect your ipod instead of the mic.
Just make an attenuator to reduce the level and to add the stereo channels into mono like this:
The output of the attenuator has a signal wire and a ground wire, just like the microphone had. Connect the output to the microphone input of the IR transmitter with shielded audio cable.