"Im having a buyer, who sells also, constantly harassing me to cancel
per their purchase."If you let this happen more than once and did not
block , I have no sympathy for you .
Why do you think it is your job to be the ebay police ?Every buyer has
the money back guarantee if things go wrong .This is not your problem or
concern .
So what you are saying is that you want a bunch of people to buy from a
new seller and vet them for you so you can purchase with confidence ?
Why don't you be one of the buyers for the new seller to vet them for
the rest of us ?
In your very own words "The last time I did this (a couple years ago) I
found that by refunding my money the item got flagged as an unpaid
item." you answered your own question .