I am positive I saw a picture ages ago (late 1980:s, when keypad phones were starting to become mainstream in Sweden) where someone had "solved" the problem by

I am positive I saw a picture ages ago (late 1980:s, when keypad phones were starting to become mainstream in Sweden) where someone had "solved" the problem by building a pocket calculator with a rotary dial. I'm not sure whether it was a mock-up or an actual device. :)