Once you bring a lawyer to the mix you need to have a new job to go to immediately as your current employer can say you stole a pack of post it notes and fire you.
I would just find a new job that is a healthier head space.
I get wanting to get back at a shyt employer but do you really want to have to go through something that will probably not be worth a dime once the lawyer is paid??!
Hope you do what’s best for you.