
Isn't the "post" BB code what you want.
After clicking on the post #, copy the internal post number from the URL, in the case of the first post on this thread it is 933790.
Then use the BB code
[post=933790]look here[/post]
i.e. If you want to go the first post in this thread,
look here.
This places you at a specific post, and you can go forward or backward in the thread it's in.
Am I missing something in what you're trying to do?