That's pretty much what I did. I bought a super cheap pair (0.5 SPH) at $5, split the lenses and placed them over each other until what I saw at a distance was

That's pretty much what I did. I bought a super cheap pair (0.5 SPH) at $5, split the lenses and placed them over each other until what I saw at a distance was clear enough to read. I added up the SPH (they were 0.5 lenses, I ended up overlaying 4 pieces - so 2.0 total) and bought the resulting glasses. That was about 2 or 3 years ago and those glasses are still perfect for me.