NACA funded sale's structure advice, please. TY!

[Ari B.]

A buyer is interested in purchasing my listed flip using NACA funding. Other BP sellers seem to have had successful NACA transactions and I'm inclined to accept the offer. The issue is that the program can take 6 months to a year to fund. The home is vacant and buyers want to take possession immediately. They seem to be reasonable folks who are open to figuring out the fairest way to make that happen.

My understanding of NACA is that borrowers receive 100% financing with no down payment, closing costs, or fees. I am trying to determine the best way to structure this deal.

Sale Price: $245,000

Market Rent: $2,000

Buyer willing to put down a non-refundable $4,000 fee (option fee, down payment, however we want to classify it).

Possible structures considered:

1.  Lease Option:  I like that buyer has skin-in-the-game with the non-refundable $4,000 option fee.  Rent would be at market and no rent credits would be provided.

2. Installment Contract/CFD/Seller-financing: Not sure how that would affect their ability to qualify for the loan. Could possibly be construed as a refi instead of a purchase, but not sure if that matters to NACA.

Thanks much for the advice!!