Hey there is a way to get a mic input. This is only because they discontinued the VMC-K100, which added a 2.5mm input for AIS. This is a hardware hack, so find a cheap AIS mic. I used the ECM-HGZ1 for this hack. You open the casing and take out microphone. Then you find a 2.5mm input at radioshack and cut a hole in the side of the casing for the input hole to fit snuggly. solder the two red and black wires to the prongs on the input and put it back together.
Here is picture and further directions:
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Have a great time.