I'm thinking of doing this to mine - get a hot glue gun ready (extension cord, or even power inverter) and place a reallllly small dab on each of the buttons. Small enough so it won't run, but just enough so that you can "feel" them at night.You might be able to use something else in place of hot glue (it's just easier to remove if you mess up). There are various other rubber compounds, or even those little rubber feet you use on certain equipment (if you're in the computer industry - run across these all the time).
Anyway, just some ideas....
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