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What we need to do here is to figure out some method or means of making our own coloured or clear keycaps (the cap part I mean, not the stem assembly...) from a material such as low-melting plastic (ie "Friendly Plastic" aka "Shapelock"...) or two-part epoxy mix, which can be coloured.
I have given this idea some thought, and have come up with a method or two which could work, but I lack the tooling to make the items required to produce a mold or a ram for pressing.
The third-party replacement caps and/or custom printing of caps is simply not practical economically...as we already know.
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Spec57