We're talking about kids who have gone through the lengthy/stringent special education evaluation process- very little chance of students faking that convincingly enough. I personally could see giving those sorts of accommodations, as long as you can make the case that not doing so would be legit harmful for whatever reason (emotionally I guess). I honestly could see an adult looking back and being grateful that they weren't forced to do something that made them extremely anxious/stressed. I would make plans to do some sort of exposure therapy so they can develop confidence in their own communication (talking/reading to a younger grade would be an example).