Sounds like a custom fab job. I tend to doubt there's a suitable one just floating around out there, and I doubt even more that joyetech has any plans to introduce one.
A 510 hybrid adapter (with 20 x 1mm threads) fits nicely. Just tried one. Add a slightly raised post on the inside to make contact with the battery and it would function. Would not look so great though unless you also did something on the outside for appearance sake.
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