I am writing this post to see if anyone from Steemit, Inc. can help out the account holder @cupidzero.

No. Steemit Inc. doesn't have any priviledged position in this case. As an account creator they were in position to be your account recover agent but that's only for 30 days after changing keys.

I don't know how to help him directly, but I thought I could make a post and see if someone that sees the post can help him.

Well... :-)

The @gtg account is apparently "Gandalf the Grey", who is also a Witness, and while his intent appears to have been benevolent, his intervention has actually divested me of my account entirely rather than just losing the $25 in it. Is there anything I can do to get it back?

You wouldn't lose only $25, by that time you would lose that account, reputation and all staked (over 170 STEEM) amount.

Could you report my account again to reset the recovery period maybe?

Unfortunately nobody can do that. Recovery period is set in stone.

Fortunately, because of that keyhunter research back then, YOU CAN get your account back.

Please contact me directly on steemit.chat, as Gandalf

^{Treasure your passwords /パスワードを大切に by @fukako}