I think the way theymos is handling this currently is fine. You either can prove in a very specific way that you used to own a certain account or you cant. If you cant make that PM1 just make a new one.
He even offered a way2 to make sure you have a BTC address that can not be deleted by a hacker.
[1] https://bitcointalksearch.org/topic/recovering-hacked-accounts-or-accounts-with-lost-passwords-497545
[2] https://bitcointalksearch.org/topic/m.7169449
Topic: delete - page 3. (Read 3709 times)
What accounts got hacked? I haven't heard of any.
delete
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