Hi
Sounds like I am doing roughly the same resto as you...I used some alloy wheel paint for the subframe as it was less "silvery" a bit more of a graphite shade in it. It was a really close match to original. I don't know if you still have the colour code sticker on the subframe rails, I did, so masked around it carefully.

Next week I turn the bike round on the bench having completed the rear end and start on the front, any advice on refreshing the top/bottom yokes, forks, clip-on's, cockpit area... greatly appreciated.

Cheers
Max