You've said it yourself - he's a terrible catcher, probably shouldn't even be a catcher.
That makes him a DH who's having a bad season with the stick.
He's had one good season.
'Petition the Commissioner' strikes me as funny for some reason. Does this mean you have to craft a nice little begging letter like it's a tax appeal or something?
Severino just might be a victim of the so-called Verducci Effect because of his innings jump in 2017. Verducci only had 3 pitchers on his list for 2018. Severino was #3 on the list.
Sanchez dealt for an ace? His trade stock would be pretty low at the moment. Right now he's a DH with a 700 OPS + injury concerns + attitude concerns. Not a very attractive package. I think you'd be better trying to rehabilitate the guy somehow.