Yeah, I'm all for playing it out - I think we all latched onto this plot idea because we liked it :D
I think I'd like for Wes to feel like he might have a leg up on the whole competency thing, since he's well-versed in magic and he's got the whole planar door opener thing going for him. But I can totally see Faerie being the kind of place that totally messes with him. He tries to summon his spirits and instead it's like an Alice in Wonderland LSD nightmare and Fae keep impersonating really outlandish versions of his spirits instead. Like he gets very much overwhelmed, can't make sense of what's real and what isn't there.
I can see any of the three of them being the one to snap him out of it - Del with her Faerie expertise, Noel with his true sight whatevers, or even Yoona with her disbelief.