This is good. It’s also already a suggestion.
I guess this would be a fine bandaid fix. But I think the method of upgrading deckhands just needs to be changed as a whole. Collecting 20 clearstones or however many repair hammers isn’t hard at all and it isn’t fun as a challenge either; it’s just a random grind that you have to do for mostly minimal PvE benefit.
The theming is fine but only if you’re actually in the clan since joining either of the NPC clans already changes your ship’s crew and colors.
The issue is that their effect is basically ganking QoL that might be too op… which I don’t think is a good idea for the game (and especially not as a deckhand profession).