Edit to add 3 / Another option would be restart with the original history so people don't outright lose old coins, but make the new block reward such that the entire 'last known' coin supply on the old chain would be reissued in a few weeks or so on the new chain. That would make old coins worth very little but still something. That would need a block explorer though to examine the history roughly post 2019 to look for unusual surges in coin supply that might have been behind huc's early death.
How we build a "treasury" could address some of that, since if the old coins are valuable they ought to be able to buy a lot of stuff to put in the "treasury"; whereas if they are worth close to nothing they'll be able to buy close to nothing to populate their "treasury" and donations will be needed to get a decent treasury together.
It might not need to be worth much at first though so maybe supporters could start a FreeCiv civilisation among the "civilised worlds" that uses HUC as its currency, and have that civilisation put some of its earnings into the "treasury" so as the civilisation grows so hopefully will the value of its currency.
We have already gone through this "turn it into a treasury-based currency in the Galactic Milieu" process with other coins, not all of them are worth a whole lot per coin either; a few alliances with other minor civilisations might find some willing to trade some of their currency for HUC to put in its treasury in return for some HUC to put in their own, things like that. Also it is possible some HUC whales might by now be whales in Xaya or various other currencies and be willing to put some of those toward the project of rebuilding HUC's buy-side order-books.
Or maybe HUC could just go the way of several early blockchain-based coins, recognising that paying third parties to mint their currency for them is a poor expense to carry and switch over to being natively a token on some token platform. As allowing third parties, some of whom might even be among one's actual enemies, to mint one's currency isn't always a great idea.
That last idea though doesn't fit with the idea of preserving HUC for its history, keeping it as antique-retro blockchain game.
-MarkM-
I remember your involvement with many old interesting coins a while back.
But...a treasury is not really something that is good.
People can make money and decide where it goes without help from benevolent treasury workers. If something lives or dies it should be on voluntary donations, not anybody pressuring donations to a treasury. That fills up the morgue equally rather than creating one group which is more heavily represented.
I have absolutely none of any old chain for it.

Hopefully if there are still people running it covertly some will come out of the closet.
With AXIOM when it forked so badly the exchange could not resolve it I "rescued" the branch they orphaned by cloning it as AXON and making sure AXON followed the chain the exchange did not. Though come to think of it neither is yet a "reserve currency" in the Milieu, aka a currency useable for "treasuries" and calculable in value from a "treasury" of its own.
So maybe if there are large alternate forks out there each can be given a different name and maybe fight for the old name or something

-MarkM-
You know in the crypto winter there have been lots of marketing geniuses running hidden chains on old coins with good histories.
It is not clear if the crypto winter is over, but either way common sense should be used with a coin like this.
~
I probably have a copy of the old chain up to some time in 2020 or so, but, again, at that point there were suspicions that something did not look quite right.
Using the old chain would require examining it carefully and figuring out whether somebody was monkeying with coin supply, and if so reverting back to before that time period.
But then if you revert to any time after roughly 2014 you still have questions about bots, fairness, etc.
So best, if a person really supports the idea of huntercoin, is blow everything up, then start from scratch at the genesis block with zero coins, very slow emission, and live or die by whether there is real interest.