If you can find a post with a NXT or NEM address in it, and then sign a message from that address, that would probably work.
in this way?
{"message":"4920616d20746865206f726967696e616c206a6b6f696c...",
"signer":"49dd8f504e1b1df914f811baa29f807f26426d017590a65a6d6e...",
"signature":"4f689f981eff768f76fb37b141138d8865e91edadc159faec103490f4f6ef3a3c46f0...c189fab82b180a"}
[/quote]
Yes mate, absolutely. If you posted a NEM address early on and can sign a message from it, I will do my best to help you recover your account.
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Clearly there has been some evolving in this site
and it is seen by requiring more (talents) from the users:
"sign messages", combine
consecutive posts to one, which may require more work when someone is answering to more than 1 post

Yes and no. Some of us are older and wiser, but we are vastly outnumbered by sig-spamming shitposters.
(pay no attention to my own sig, lol)