I know how you feel Mike. Moving targets are never nice. The increasing costs of licences, COD etc haven't helped me one tiny bit to get back into events either.
Unfortunately the marketplace is full of m'sport cars which aren't selling so that choice is not easy either.
Personally I love the variety and the "all the same" leaves me dead cold. Even some of the so called Classic Car classes are a joke where the quoted HP figures are so far out of line with what the very best engine builders could get "in the day" turn it all into a joke. Your efforts to be period correct would have been great. Perhaps take a few deep breaths before pulling the plug entirely.
In my case closer to 50 years following the sport after the costs started to get out of hand it became more sideline than taking part. Oh for the "good old days" when it was affordable for any bloke.