Hi Mal and Robert
Oh la la. Mal, I read your very helpful info twice, and now I've got it, and I have Robert's sage advice ringing in my ears too.
So on the basis that there's rarely a definitive answer, and the much respected Edgar Brooks gave us some info. I'm opting for the no-head-rest-no-antenna-wire option, which will need an easy scratch build on the mast, and a bit more fiddly work on the interior.
I think this photo illustrates the desired result:
Also note that, in that photo, there is no evedence of an armoured wind screen. An external one is obviouse so this aircraft definitely has an internal one and as it can't actually be seen (unless you get in close) I simply left off the external one and removed the fairing, that can be seen in one of your recent photos, on the upper nose adjacent to the cockpit opening