Clipboards are easy to alter yourself, with pen holders, watch holders etc.
As far as headsets go, do not buy cheap imitations. The retailers may tell you they are as good as David Clark, but very, very few are.
My own are DC H10-13.4, which are completely wonderful. DC's have, in the past, had accusations of being hard on the ears after a long stretch. These aren't. DC 's are worth every extra penny you pay for them, both in the initial sound quality and in the way they just go and go and go.
You will never regret buying DC's. You may not regret buying another type, but it's much more of a lottery.
And no, DC don't pay me a retainer! Having read the above, I wish they did for just speaking as I find...