Never mind $3k, $100 is even too good a deal to disclose that you're one of the presale participants. "Proceed with caution."
Revealing its ownership to anyone mean opening your system up to phishing, social engineering or targeted attack in future. Ethereum's own security guidelines clearly state that wallet recovery data or key should not be shared with anyone. On top of that the way old wallets are being hacked these days and scammers finding their way in, selling a historical address is nothing but harming yourself.
With Middleman ofc.
Keep in mind that the address will be used only as a memorabilia,and you’ll still have access to it (private keys cannot be changed)
No matter how much you try to paint this as a "it's just for memorabilia bro", it still sound like shady. An old Ethereum presale wallet is the only OG identity in crypto world.
And thinking that having a middleman will reduce the risk is ridiculous, lol!