A few ideas:
About the frame. I wouldn't bother respraying it. You'll never recapture the essence of the original paintwork. New bartape and matching tires go a long way for aesthetics.
As for parts, I see Dura Ace 8s. You can source 8s STIs and make that the only component change. Easy! Everything else will work.
Another option (my favorite if you want to keep the DT shifters) is to fit a 10s cassette and chain on there. You might need a 9-10s big chainring but everything else will be compatible in friction mode. You won't miss indexing with how smooth that works.
I know I know, what am I doing in C&V?