well if you want cheap...
i mounted a bell radar detector on the front master cyc with velcro and a mini bungie to keep it in place during wheelies
i can easily remove it an use it in the jeep on road trips
for 150usd you get a decetector that runs aa on batteries or ac and has a remote speaker that i tucked in my helmet in the cheekpad right by my ear
i know this is not at all like you described but i fiugred that i am [as well as two other ridding buddies] very happy with the set up so you may like it too
good luck
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surly
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surly
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