heh! no this is awesome! I'm so stoked that people are motivated to sort of bounce these kinds of ideas around each other! Awesome man!
Please keep on posting!
How's the weight on it? I guess if the shaft is short enough, it shouldn't be an issue.
In its present form it is 7.5g, which is pretty light, it wouldn't affect anything but really light switches I think. Trimming off a bit of the top edge would cut that down too (the base is 2mm thick and the edge sticks up 3.5mm, probably more than it needs). I was thinking of cutting it down to about 1.5, enough to stick some sort of letter card on it and then perhaps lacquer or plastic cap. I would think the fancier metal caps would be heavier. I think the one I made for Moz was about 2 kilos
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I got 10 of these caps for £2.50, so about $0.38 each, normally they are about double but if it worked I would try source some plumber wholesale option. I got the screw threads fairly reasonably (for me), about $0.12 an inch from some remaindered bolt shop. I have 9 caps left so maybe I will try make a prettier one once my self-imposed craft list is clearer
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I saw someone use buttons for keys, I couldn't find any that looked ok, or sturdy enough. But that would be a lighter option if real caps were hard to find.