Hi Dave,I can't give you a suggestion for a headset from a users point of view, but when I was looking on at the exhibiter list for this year's Sight Village in Birmingham, I came across a company Called DD Aware, who may be able to supply you with what are looking for, or if not, something similar.
The companies website is www.ddaware.co.uk and I think you will find what you are looking for under their products heading on the website.
Hope this helps.Alexander Shannon
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