I will deal with the possible recovery issue later as you can imagine it will take a while to get a new clean email account that I can trust is not compromised.
Recovering your account might indeed take some while, but best if you send out the message right now.
There's a clear rule how to proceed, take a look at the thread over here:
Recovering hacked accounts or accounts with lost passwords.
I understand that. Right now the pressing concern is just to get it banned and for that I was hoping that any mod could verify via BM message and lock/ban the account.
Recovery will be more complicated however as Theymos doesn't accept Bitmessage, and although there is apparently some correlation between Bitcoin and Bitmessage addresses and keys, I am not sure if I can somehow extract the key from BM and sign a message which would verify in Bitcoin wallet. If anyone has any advice on that I'd appreciate hearing it.