As Brandon says, you're stuck. But then so is the seller.
A conduit loan has a defeasance clause which prevent the early payoff. Its like a pre-payment penalty on steroids.
Now is the time to ask the seller to kick in for these expenses.
After all, its their loan.
If the seller getting a novation, a full release of liability, they will be motivated.
And make sure the loan due date is well off into the future. (>5 years)