there is a metallic blue on the Gunze range that’s OK or Vallejo do a blue and green. The latter need spraying over a gloss silver metallic base. Worth noting that Aotake is found in several blue/green shades and it varied. Some claim it weathered blue to green but researchers believe that it varied in the factory application and aircraft have been found in a patchwork of different Aotake shades. On 1/24 scale kits that means there is lots of scope to add interest to internals using different Aotake shades.
By the way, Vallejo do a nice ‘Ash Grey’ for the Pearl Harbour camo scheme in their IJN set.
I've got a 1/48 Zero (in the green colour scheme) in my stash waiting for some attention and I have a Tamiya metallic blue I was going to use for the Aotake.
Watching this to see how you get on (1/24 must be a fair size).
Looking good so far!