I would report the sale on Form 8949 and Schedule D, even if not otherwise required, to show that you are electing out of instalment method.  

On schedule B, quick zoom at top of form to enter seller financed interest, as you need to put payers name, SS, address, and amount

I agree.  Found a worksheet that can be used to enter Seller-Fin just under Schedule B, then Int/Div Summary.   The same info that would be at the bottom of 6252 can be entered there.   Borrower name, address, amount, ss#.

Now the challenge will be to get the ss# from the borrower...

Thank you!

Yes, thank you!

I found it in the list of forms, but clicking on it from Sched B is easier...