The "btcrecover" is not an option and merely a false hope to whoever has lost their bitcoins, in theory when explained it sounds good. But that's it, it just sounds good.
I have used other methods and done so successfully but if anyone here expects me to go ahead and post a proof of concept when there is 3 BTC being offered as a reward, you're sadly mistaken.
Can you tell me what sounds good when i initially explained btcrecover in this very thread.. Here is how i explained the OP's odds:
BTW: there is no magic trick for recovering a wallet.dat password. It's basically always brute-forcing, so the easyer your password was, or the more you know about your password, the higher the odds it can be recovered. If you picked a strong password and you have no clue as to what it might be (or contain), the odds of recovering a password are very, very, very small, even if you use a "professional" recovery service.
And i still stand by my words... I have used btcrecover on my own wallets in the past, but i had a relatively decent idear about what my password might have been... I clearly stated that if the OP has no clue, and he chose a relatively strong password, his odds are very, very, very small... And i don't know about any "tricks" that make password recovery for an encrypted core wallet any easyer... Sure, you can use other, more performant, tools, but it'll always be brute forcing...