I use Brian's method with one addition. I use the NRS accesory carabiner as a leash. I clip the carabiner side to my shoulder strap and loop the keyring through the lanyard tether opening on the radio. You may need to buy a smaller keyring to fit your radio.
Here's a link to the carabiner. Hopefully, you can visualize the rest:
Kayak & Canoe Outriggers
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