Yes, I got title insurance, but I cannot take possession of the property until the lawsuit against the previous property.

Next option is to postpone the closing until after the "permitted and inspected" repairs are made to the property.  3rd renegotiate the purchase price of the property to reflect the damage to the property.  4th create a contract between you and the seller where you take possession of the property and the original owner pays for the cost of repair, this is usually through proceeds from the insurance claim.  

But I don’t recommend this option, because if you or one of your rental properties suffer a catastrophic financial loss (not likely but possible), your creditors will go after not only your business assets but your personal assets as well, which includes money you have in the bank, your home, car, and other possessions."

Who currently is in possession of the earnest money? 

I highly recommend you go through the eviction process and allow the court/law enforcement to safely turn over possession of the property to you.

Is there any other way, short of adverse possession, to expeditiously acquire such a parcel?

A guess the silver lining here is (hopefully) this makes it easier to exercise your constitutional rights as a property owner and regain possession of your asset.  

In my area it is common for the lender (bank) to seek clear title, and providing vacant possession, for the benefit of a purchaser, at the expense of the seller.

ONCE you hold for me _____________  put your lending entity in there.1. signed note2. signed and notarized Deed of Trust  Note does not need to be notarized3. when you can issue a lenders policy with my entity in first position no junior loans.4. you are in possession of Insurance dec page showing my entity as the mortgagor or additionally insured.

It's not a poltergeist, it's not demonic possession, it's not cursed ground or a cursed structure, as the cabin is a new structure on new ground.Does someone who might have keys to the place not want you putting in Airbnb guests there?