Sena make a device called the SR10 which is built for precisely what you are describing.
I had one and it worked beautifully with both SENA and Cardo helmet units.
Now the bad news, they are about $300 new, and you will need to spend an additional $75ish for the correct cable to connect the SR10 to your particular walkie talkie.
There are a variety of form factors available depending on the brand of radio.
So, unless you are going to use a 2 way radio on a very regular basis (which I did at the time I had one) I think that option might be a tad overkill for your one day course.
Life is not measured by how many breaths you take, but how many times you have your breath taken away
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