Ebay now has very strict rules regarding the sale of bladed items and, as you have found out, don't allow collection in person.
For this particular item, the best advice would be to sell elsewhere rather than trying to circumvent the policy on this site.
"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)