Mike,
I thought the seats remained the same basic pattern throughout the life of the Europa, and sitting in the TC sounds pretty much what you describe, there's not a lot of room to move about
Although headrests are all about whiplash prevention these days, I think back then it was more of a genuine "head rest" designed to support the whole body in a car meant to be a true GT. I happen to be the ideal size for this generation of Lotus cars (5'8", same as Chapman) so I find the car very comfortable to drive, more so than lots of modern cars.
If you want to swop seats then there are limited options because they are quite narrow. The Elise seats would fit and have a much thinner headrest, but even fitting the latest S2 Elise seats they have far less padding in important areas than the standard Europa ones. In the UK there are a few companies making aftermarket seats for the Kit Car brigade and as most of these seem to be Lotus 7 derivations, they are also narrow and would slot in ok, no doubt you guys have similar aftermarket seats over there ?
Brian