When Creating a new mitigator, do you apply limitation to disadvantage?

[Pseudonym]

Hi,
been lurking for a few weeks and I have a question about a problem for which I found not an answer with a teeny bit of googling.

First the question, then the exposition: If through whatever means imaginable, through the course of a game, if someone comes upon a magical artifact that can "cure" a disadvantage, does the disadvantage acquire a "mitigator" limitation? If so, does the artifact then cost the character points of the mitigated version of the disadvantage, or the character points of the entire disadvantage?


So I have a character in my campaign that was born with dyslexia, and has recently decided he'd like to become a teacher, but reading is (in game terms) literally impossible, and so I want to make a method for curing his dyslexia.

I have read the Ritual Path Magic charm system and the Metatronic generator system, and was thinking that a fair way to be able to buy off the disadvantage would be to find a magical ring or amulet to spend character points on that would be almost the equivalent of "buying off" his dyslexia when he needs to study.

But then I was wondering if this creates a weird feedback loop because then his dyslexia advantage might need the "mitigator" limitation, making it cost less, which would then make his ring cost less character points.

I think by the rules in the basic character book, since an enchanted item bought with character points isn't easily stolen or breakable, and it isn't an expensive on-going treatment, so I would think there is no mitigator limitation on the disadvantage, but wanted to double-check.