Option 1
Credit partner
Someone with stronger personal credit can join the file. They are on the application. They take a small percentage of the transaction for that risk. Underwriting partners see them. You see them. There is no silent signer in the next room.
A credit partner is a person with a name, a credit file, and a contract. If that idea makes you uncomfortable, say so on the call. We will not talk you into a structure you will not own in daylight.