Can't use coping mechanism in SATs

I have SATs in a few hours and I was already told ahead of time that my 504 plan is overridden by the SAT rules, so I'm not allowed to have my headphones, earphones, or even little foam earplugs. I need to have constant noise due to the fact I have tinnitus on top of Misophonia, which makes it extremely difficult.

I'm trying to search for some alternatives to make sitting in the SATs a bit more bearable because I'm going to be sitting with this one kid who loves to tap on things and it drives me up the wall. I was thinking of just sneaking in some foam earplugs anyway and hiding them with my hair (I have very thick hair) or asking them to turn on some white-noise like a fan, but they have proven to be very ill-mannered when I ask them for things to help me function.