Guild Wars 2

Everyone should have access to Hall of Monument (except for the gw1 items), where Kimmes The Historian would be selling living story skins and minis for anyone who has completed its living story achievement.
It could also be the home of this other historian https://forum-en.gw2archive.eu/forum/livingworld/lwd/The-Historian-for-people-who-missed-content/first

Technically the Hall of Monuments is available to anyone. There’s an NPC in LA that gives away the portal stones for the place. However, I do like the idea of having access to past skins.

You talk to Scornheart, an NPC in Hooligan’s Route in LA. http://wiki.guildwars2.com/wiki/Scornheart. He “sells” portal stones for zero copper each. This only unlocks the instance. The skins are not available unless you have already earned them.

If with public you mean accessible for all, then it allready is as indicated.

If with public you mean open world, then no. The charmable pets you unlocked roam around in there, that would be impossible if it wasnt instanced.

What most people are missing is that the OP wants to turn Kimmes into a SKIN LOCKER once you got say the meta for this LS you would unlock the ability for any toon on your account to visit Kimmes and get the latest Gas Mask skin you have unlocked. This would allow you to change looks of your toons more often. You would also drive the need for transmutation stones, which btw I hate them. If they did do something like this please allow each skin to have a price to pay Kimmes to get on another toon but at the same time allow those skins to have a trasmutation ready to use like some of the other gem store items that have come in the past.

I have suggested this idea myself and wished as well that Legendary’s be made into skins that could be used across the account via this idea. Then they made them have the stat change, so I don’t even know if they could do that or not now.

Why not instead put the home instance to good use instead. Also at that point give a warp stone like with HoM

No one outside of gw1 players should be allowed in the HoM imo. Regardless of what they do with him if they want a locker npc add it to the home instance and make it more useful. Im still brooding over the use of the fellblade skin for the “new” boss weapon skins

it wont happen for one simple reason; skin npc already exists http://wiki.guildwars2.com/wiki/Black_Lion_Weapon_Specialist