"They shouldn't be harder than humans - not straightforward but not impossible in principle."

Smile. 

"Your alt is very excited about all the magical engineering you did."

"Does he know about the part where -"

"Not to any granularity."

"Does anyone yet?"

"About you in particular or in general? I warned Maitimo."

"In general. That's good, he'll figure out how to tell everyone else."

"Yes."

"I'd like to meet my alt but I imagine everyone'd like that."

"Everyone would. People are, ah, expecting Maitimo and his alt to compare notes and get everybody matched, which is part of why I warned him. Yours is however particularly easily located."

"Oh?"

"I'm a friend of the family, if you want to come home with me I can bring you right to him. But if things are going to be awkward with the relatives perhaps the other way around would be better?"

" - technically not relatives I disowned them but that probably won't make it better - if we stick to talking magic I bet it'll be fine -"

"And maybe languages. Doesn't seem like it'd be hard."

"I actually sort of expect them to avoid acknowledging it - my grandfather didn't like admitting he'd made mistakes very much -"

"Very occasional. I wouldn't expect it."

"Then by all means I will come meet them all."

So she ferries him to the other Tirion.

Where he can in fact fall in immediately with his alt and his alt's father and grandfather and talk magical engineering with no awkwardness and no acknowledgement of any other features of his world.

Good.

"I told everybody what to expect."

"Thank you."

"It's not clear to me who my counterpart is in the other Valinor - to decide what technology they want and at what pace, that sort of thing -"

"Arafinwë's in charge formally..."