How about the 1H61K address I mentioned earlier?
You can use the 1H61K address or any other you find that I've posted in the past and does have some BTC on it.
(I could sign with that address if you point me to a quick and easy way to unpack a 7-Zip encrypted wallet-file, extract the private key and sign a message in a safe environment on a potentially unsafe PC.)
ya.ya.yo!