I admit I deleted all my hunters call voyages without even attempting to complete them. From what I understood they were just kind of like a fishing tutorial kinda voyage to teach you about what kinda fish spawned where? I don't even remember when they happened if it was part of the holiday event calendar when they gave us a new voyage every day we logged in.
Point being they did exist in some capacity but they never did anything with it. Considering the map boards exist at sea posts would make sense that they could allow us to pick them up there. But yea the hunters call grind was crazy long. The sad thing is even if they gave us credit for our past hunters call progress in the captaincy update we wouldn't even have been halfway to some of these final trophies. Like their idea of a hunters call update was to take an already tedious grind and dial it up to 11. Even a voyage to catch X number of fish at an island and having the voyage down would prevent splashtails from spawning during the voyage would save a considerable amount of time.
Honestly I think fishing is something they aren't putting much work into at the moment. It has pretty much gone unchanged since its been added. The only change I think they have ever made is throwing the names above the fish so color blind people can now actually tell whats trying to bite... Even that took far too long to implement. So we can hope for an update to hunters call but I wouldn't hold my breath.
You could take the more passive approach to hunters call reputation anyway. Sell what ever meat you happen to come upon in ship wrecks and always check rowboat storage. Also gems can go to hunters call most people level it that way, and you can buy 1 level per month for doubloons. I cant say with certainty as I haven't tried it but perhaps breath of the sea can be sold to hunters call as well since they act like gems in terms of the other trade companies anyway.
Hunters call is a shining example of why I think deleting a pirate or leveling an alt seems like madness. Losing all that progress, all those cosmetics, just so you can get dopamine hits from seeing the reputation bars level up as you sell... We now have season progress as well as pirate & ship milestones for that and there are commendations to 100% as well. Would be nice if the game allowed you to pin commendations so maybe as you progressed you could see that bar go up to replace that feeling leveling reputation used to give.