If you say it has a dongle at the USB end, then the wire probably runs the direct audio feeds. You could try cutting it and soldering it into a 4-pin XLR, but because COM'S use dynamic mics, and you'd probably have a condenser in the USB headset, you would need to add a bit of circuitry + a battery,
DIY Lightweight Clearcom Headset - Mat Goebel: Sound Designer
I've been meaning to get the parts and build just a converter that lets me plug any 3.5mm pc headset in with a 4 pin XLR + battery on the other end, but haven't yet.
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