Can't you bind, for example, the Astral Gate ability to an artifact? Make it a Ring of Teleportation. Make it a separate ability, just like the spell itself. It's absurd, of course, but it's still a temporary ability. It would just be incredibly overpowered.
(Not exactly related to the heroes, but I'm suggesting it as an artifact idea.)
But if you need a "reinvented wheel," then it can only be done in a very, very ugly way, with lots of dialogues, etc.
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