So sorry to hear that Chris. Thanks for sharing. It's a good reminder to us all that our vacancy budgets need to also reflect the potential for dead beat tenants and not just vacancy. Offering cash for keys or pursuing the eviction as quickly as possible is really the only options.
As far as entering the property, is there a really good reason you need in there? I understand the need to do inspections, but if I'm having trouble with someone, especially if it is heading in a legal direction, I tend to stay far way from the property. I don't want any accusations that I did anything illegal.
As far as selling it, that will not force him to move either. You would just be passing on a bad tenant to another landlord. I inherited a bad tenant once. Then I quickly realized that the property went up for sale about a month after the tenant moved in. I suspect they realized they made a mistake , jumped ship, and made the next guy (me) fix their problem. I ended up getting them out without too much pain and I love the property, so all is well.
I see your doing this full time, so I'm assuming you have other properties. Is there enough cash flow from other properties to allow you to keep the house? That would be terrible to lose your house over this guy.