Honestly, I wish his domain had more to do with his cursed technique. The only example I see merging well with his ability is the first one, enabling him to bring forth more powerful versions of his shikigames. (chat gpt translation)
Why don't you do something like a roulette wheel that draws abilities from the JJK world and turns them into Nen abilities for her to use for a limited time?
Ch 34 Nen Ability Discussion
Into the Hunter x Hunter world with Jujutsu Kaisen System