Ebay do not get involved in any frreight/postage.
i would say no to your potential buyer.
They could investigate a freight service themselves (for example, Shiply), but might find the cost is prohibitive.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)