@kommodoreyenser
The reason I say it's easy is because all it would take is getting on Discord and asking someone with the Legend of the Sea of Thieves title (and there are plenty) to jump in the game and throw the ship cosmetics on for you and your crew. I'd prefer something with a grind that can't circumvented that way.
Also, I did mention in my other post that a PvP commendation in Adventure would not be a good idea. If they create a "Kill X number of players" or "sink X number of ships" commendation, that would encourage one-dimensional player interactions where Pirate Legends are incentivized to farm other crews for kills.
I think locking the OG Legendary Weapons to The Arena was a bad idea in the first place. They belonged in Adventure, and now Rare found themselves with backlash for allowing people to still complete the existing set (as they absolutely should) and irritating those who earned Legendary Sea Dog.
When push comes to shove though, no part of the Pirate Legend cosmetic set should ever be removed since it is an essential base game set that is meant to be perpetually a part of the game for anyone who reaches Pirate Legend status to work toward. You should always be able to complete this set, and I don't think Rare's solution really satisfies that. The black chains don't really match the regular set. But again, this was the corner they backed themselves into by putting part of an Adventure mode set in The Arena