I was kind of thinking more in the sense of a linked individual attempting to use an Arkentool. This is sort of reversed, with Charlie using the Arkentool to link but nothing beyond that.
In any case, I dunno if it's that unambiguous. That she was linked from a long distance does mean the Dish was involved in the process. But it could have been Charlie using it to link two different casters rather than linking himself with Vanna. If I hold that opinion - and if I do, I don't hold it strongly - it would be because:1.
I have a sticking-point about believing Charlie to be a caster, though, simply because I'm having difficulty seeing how a Stupidworlder (which I think we generally agree he is) could learn how to use magic in this world. 2.
I have difficulty believing a control freak like Charlie would willingly subsume his mind into a larger whole, though perhaps the Arkendish lets him get around the whole "losing your individuality" thing.
"If you leave out important things or events that you know about, the story is strengthened. If you leave or skip something because you do not know it, the story will be worthless." - Hemingway