I have progressive segmented bifocals called "Smart Seg" that are a variable lens in the lower half of the lens. At the top of the bifocal region, just below mid-lens, the focus distance is 30 inches, so the instrument panel is sharp. At the very bottom, the focus distance is about 12 inches, so maps are crisp. They are ideal for flying.
Overhead switches are a pain, but you can get special small segments inserted that focus at short distance for them.
I bought my glasses from an outfit that specializes in airline pilot's glasses, called Hidalgo's in Texas. They are pretty inexpensive, and nice folks (it is nearly a one-man operation). They can make special pilot glasses with the upper segments, too.
http://www.hidalgos.com/