The 6-mile folder has been updated with some ocean maps – hopefully an adequate starting point for your age of sail campaign. You’ll definitely need to double-check that the desired islands are present & probably should manually label some of the smaller atolls in the Pacific. I also wasn’t sure of your desired scope, but I set up the map coverage for minimal overlap so that one could move off one map and onto the next without too much fudging of distances.
Color-coding hexes by water depth is definitely doable, though building it into this script would take some effort. I find that for maps like these they complicate the visualization a bit since color is already used to denote biome on land, but I definitely see the utility (and arguably depth is loosely analogous to biome in aquatic environments). Will definitely add it to my low-priority to-do list.