Get their card and send them a nice "thank you" note.

You have your loan, credit, finance information.You can use your credit card to pay for repairs.

I’m sure I could pull the old “well you’re names not on the mortgage” card, but the loss of my potential ride-or-die for an extra 800$ doesn’t seem like a very good ROI.

This might still be a lot for applicants in a C-class neighborhood, but it will be much less work for both of you if they can do it online (again, assuming they have access to a computer and a debit or credit card).

We paid out of pocket for the rehab (with a little help from in-laws), and also opened up a new Credit Card and used it for many of the material and some labor costs.

Would I be required to form a new business account and credit card? 

Sorry it didn't work out and I lost your $100K, but it's all good, I'll send you a nice holiday card at the end of the year."4. 

I have considered any and every expense associated with the project, including credit card/paypal fee's, credit card interest payments, travel expenses.

Can anyone recommend low cost low rate options for credit cards ?

In 2015 we went through a personal tragedy and we were forced to use credit cards to deal with it.