I'm wondering if there is any available mechanism or process for requesting to be given access to an abandoned account?
There's none.
We plan to Re-ANN the coin, but it would be way better just to correct and take over management of the existing ANN, thereby reducing the clutter on btctalk.
The only possible way:
- OP of that thread should make a request (to admins) regarding the transfer of the thread (to you), it will be as if you were the one that created the thread.
Since you mentioned "abandoned account", you should forget it (the whole idea).