I am not sure if this would work. You have 2 handhelds with remote PTT jacks on it.
Set Radio 1 to the Input freq Set Radio 2 to the Output Freq Take the audio from Radio 1 out jack for the external earpiece and put it to the small jack on the output freq. In theory it should key the out put radio to rebroadcast the signal. my MP3 player has a record feature that will allow you to go from the head phone size jack to the smaller jack. I am going to have to try it when I have some time, but any thoughts on this?