With all other turfs being perfectly renewable, it's a shame to see Ancient Stonework getting left behind. Meanwhile, the Celestial Altars let you craft 6 Moon Crater Turf and Mutated Fungal Turf for 1 Moon Rock + some other item.
So perhaps we could craft Ancient Stonework the same way? Something like 1 Moon Rock + 1 Thulecite for 6 Ancient Stoneworks. You could theoretically use that to dupe thulecite, but you would still need to clear the ruins to get a Deconstruction Staff and if you've cleared the ruins, you can duplicate Thulecite via Thulecite Suits, which is a far better deal, so I can't imagine that would be an issue.
And if having Ancient Stonework, a turf from a late game area, be craftable from the get go at the "early game" Celestial Altar, perhaps it could be only available to craft at the upgraded Celestial Orb?