Oh, one more thing. The huge Japanese battleship was called Yamato. Yamamoto was the name of Japan’s most famous admiral. Maybe the arrival of Admiral Yamamoto would indeed correspond to having an extra battleship, but I’m not sure that’s what you intended.
If you are really looking for a good finish on all your HBG pieces, you could buy a couple small cans of differing lacquers and test each one. $20 should get almost 3 cans worth. It may be a waste to some degree, but at least you can know for sure which one works best.
I have a flat Testors lacquer/sealant spray that I used on Tall Paul’s finished pieces. Granted, these were painted first, so the effect may be thrown off. However, I will say that I did not observe any level of gloss on the HBG or OOB pieces after I applied it. It was quite flat as advertised. FWIW.