I had very good luck with using Rustoleum rattle can paint on my gloss black Raleigh Competition, so I started my color search by looking at the shades of red available from Rustoleum. It looks like the best available match is Gloss Cherry Red.
It's cheap so I also got the next darker shade (Sunrise Red), but the Cherry is much closer. I painted some wooden blocks as a test. One of these was done with the Sunrise Red as a base coat under the Cherry Red. The other is two coats of Cherry. They both look pretty good to me.
Most of the surfaces that need to be painted are raised or at an angle from the rest of the bike, which I forgot to mention has otherwise fantastic original paint, so I'm hoping that even a slight mismatch won't be obvious.
I used EvapoRust gel and sandpaper on the fork crown, but I wanted to dip everything else. (Honestly, I could have done it all with sandpaper, but I love seeing EvapoRust work!) The head tube got dipped in a small plastic container.

(You had figured out that it's an Allez by now, right?)
It wasn't quite deep enough to cover the whole lug.

(Did I mention that I've reused this EvapoRust a few times?)
The lugs came out jet black!
But that wiped off easily!
I didn't have enough EvapoRust to cover the chainstay sitting flat, so I had to get creative.
That also came out nice, but I don't seem to have saved a picture of it.
Finally, today I masked it off for painting. It's wrapped up like a Christmas present (if the present was wrapped by someone like me who is terrible at wrapping presents).