So after searching high and low with no results, I decided to make my own. I took an old pair of reading glasses (they were actually +2.75) and ground down till I made a rectangle that fit directly on top of the existing viewfinder lens. I took this little rectangle, fit it inside a black rubber washer so it was deep set, then Krazy glued the washer onto the existing eyepiece. I now have enough + and - to wear or not wear my glasses (depending on the slider setting). I tried it out today and it works perfectly.
Now I can get my eye much closer than I could with my glasses on.