Rattle canning around decals would be a mistake.

Anyway I like the way it looks now - with the sun faded two tone. I'd just polish and wax it up.

Then I'd get some drops and green Tressostar tape, and 700c wheels (you can manage it with the Mafac Racers) topped off with white Panaracer tires. (I'm not usually into white tires but I'd do it just to complete the sun-faded look.) - I go with white housing too.