We would really like to use our SMH10s when on foot, instead of our walkie talkies. I cannot believe that this would not be interesting to a large number of people.
An accessory to accomplish this does not have to be complicated - after all, a walkie talkie mostly only has on/off, volume, channel, so a 'handheld mounting plate' really only has to have a speaker and a microphone, with preferably a switch in the microphone circuit to simulate a PTT switch.
I would adapt the std helmet clamp kit, but its too expensive - obviously - as its designed for a complicated function.
Target price should be about £10 for a handheld kit, and I think it could easily be manufactured for about £1 by adapting existing mouldings.