Suggestions...
Well, this has never been a problem for me. I usually end up with other problems with a keyboard before the "letter wear" becomes enough of an issue to necessitate a replacement. A spilled beer killed one keyboard, another had the space bar go "limp", etc.
Just a thought: you could try scotch tape on each of the keys. If done quickly the tape might get dirty or torn, but a careful job might at least extend their life.
You could also try clear finger nail polish. This might eventually wear down, but it would be a quick matter to just reapply.
Again, neither of these have been tested by me, but the theory seems sound...
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