Asset Purchase Agreement Sale Litigation Finance or Sale of Rights

Under the terms of an asset purchase agreement that my old company signed, my shareholders are to be paid ~$4 million. The payout is triggered in two weeks. The challenge I am facing is that the company has no assets to pursue the seller if they choose not to payout on the agreement. I am searching for investors who would either buy the rights to the payout or finance the litigation. Any help would be appreciated.