Whirly,
I believe that the 300 hours and the 200 hours PIC that I talked about for instructing are on helicopters, but I am not sure about this and will have to check.
but anyhow having done the old AFIC course, what you want is to be very proficient flying yourself before you learn to teach others, so I would not recommend much aeroplane time at the expense of helicopter time even if you can get it much cheaper, because if they end up having to teach you how to fly on your FI course it will be a disaster, it is hard enough believe me.
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elpirata