As GG said, they are hard to combine. You'll need a physical border between them, like the Japan her in my example. Maybe I'll try again after my vacation
I like Marcel's version with the island as a divider, it seems to work naturally...
Gnomey, I like your design...the battleship as a division is a cool idea! If this were commemorating the battle of Midway, the Yorktown would be perfect.
Can easily be changed and it would make a good Midway commeration. I just put Yamato there as it was the first thing that came to mind other than Japan to use as a divider.