I was in that dilemma a couple of months ago.
My frame paint was pretty dam good for an English bike, except the welds.
We have a fantastic black paint we use at work which i brushed on the small areas i cleaned up with a rotary
wire brush. T hen i scotch brited the rest and sprayed with Hammerite smooth.
Hammerite is no where as good as it used to be ,it's now very thin and takes a day in warm conditions to dry properly
but makes an acceptable finish. and only costs price of aerosol.If you would like a jar of the paint pm me your details.
I agree with Mick on the highly polished covers ,they weren't like that originally.
I saw a superbly restored cb500/4 on ebay,in ireland contacted the guy to comment that all of the shiny bits were as they were original
He gave me the contact who restored it for him and his method was highly polish, carefully scotchbright in the same direction and lacquer
i'm happy with mine.
Rich