You can't demand that they pay via bank transfer and the courier driver would never be handling cash on behalf of a buyer.

Personally, I would not sell the item to this buyer as you will have no tracking number, or any kind of proof that you can show to Ebay that the item has been sent/delivered.

Buyer needs to come and pay you cash directly - you do not want any type of Paypal payment as again, the buyer can claim non-receipt and you won't have a leg to stand on.

All buyers have 100% positive feedback as they can only get green dots - has been that way for more than 10 years.