Good idea this part of forum. I think cordless headsets must be possible. Bluetooth etc make this a possibility. With rechargeable litium ion battery it would last for many days before recharging is needed.
This would be fairly simple to accomplish. Especially with the addition of a GPS computer to the newest model. The only down side is that when batteries and bluetooth transmitters get involved, the thing starts to get a bit bulky. The solution then would be to fit the headset into a specially made Hondaline helmet. Sounds like a good idea to me.
They may be able to do this in the US, ALOT of cell phones now have this and they dont interfere with each other while all in the same room. I dont know about the foriegn laws and frequencies to know if they could do this, say in the UK. Another thing to worry about is crossing into other countries. I know at one time they would take the microphones from c.b. and ham gear (and seal them in a tamper evident bag)if you crossed into Canada from the US.