You could just level your main town with level 9 palace, and leave the rest of your colonies at level 8 GR. The corruption would be under 10% in all of your other towns, which would be a small sacrifice to let you keep your other colonies operational and not just farms.
Also to let you know, you cant send reinforcements to your other towns if there is no barracks. So you would be able to send ships, but same island pillagers would have a field day looting your 8 warehouses.
Also to let you know, you cant send reinforcements to your other towns if there is no barracks. So you would be able to send ships, but same island pillagers would have a field day looting your 8 warehouses.

My buildings guide -- My 0 Military Defense Guide
* @Lissala slaps ImperialUser around a bit with a large trout
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