As you observed; you do not have a Hardship.
You have two separate problems; getting rid of it, and having them buy it:
About the only way to get rid of it, would be to negotiate with the Lenders for a Deed-in-lieu.
About the only way for them to get it, would be to buy it from the Bank after the D.I.L.
Probably, ask them to hold on for another year or two, bite the bullet and keep up with payments.
Good luck and may God bless