Nikon 300D remote wiring

We have a few Nikon cameras but will mainly use a 200 or 300 for our shooting. Is there a way to splice the wired shutter remote into the 3 wire plugs to use a switch on the radio to trigger it? I thought I saw how to a few days back but I can't find it again to save my life. Any other suggestions on this matter are appreciated as well. Thanks in advance!
 


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