Can't help you with the eyepiece, but hopefully someone can. I'm so nearsighted, I wouldn't be able to see the camera without my glasses, so an adjustable eyepiece wouldn't really help me.
As for the mentor: If none of the people offering their time in the TPF mentor program are "The One" then I'd suggest two things. First, you need to tell us a LOT more about what you're looking for in a mentor than you've done here: what do you primarily shoot? Portraits? Nature, landscapes, abstracts, macro, etc? What are you looking to learn? Do you already know the basics, or are you struggling with those? Off-camera lighting? Posing? The more you tell us about where your photography is NOW, and where you hope to take it, the easier it would be for someone to decide whether they have the skills to help you.
Second, I'd suggest a different method of finding a mentor (again, on the premise that none of the current mentors listed suit your needs): Instead of posting a thread asking people to respond to it and volunteer to be your mentor, start searching people out yourself. YOU know what you're looking for--we don't. So read the C&C threads from others and see if there are some posters that sound like they can offer what you feel you need.
Post some photos yourself, and ask for C&C, but beyond that, try to tell us what you are trying to accomplish. For instance, you might post a portrait and say, "I'm not happy with the way this is lit, but I struggle with off-camera lighting." Then, when people make suggestions, check them out--if their work and other comments look like the kind of thing you are going for, then PM them. You don't necessarily need to PM them and say "will you mentor me?"--that may throw some people off, as they feel they don't have the time to officially mentor someone, or maybe they just don't think they qualify.
Just ask if you can "pick their brain a little" and ask a question or two. Establish a relationship. DO WHAT THEY SUGGEST (err, photographically speaking that is...)--be WILLING to learn!
That's pretty much what I did, and look at me now. No, wait, don't do that. Bad idea. What I mean to say is, I found some very willing "mentors" who aren't that list--but you'll likely have to do the work of finding them yourself. They aren't likely to offer their services TO you unless you ask--otherwise, they'd put themselves on the list!