Many Many years ago (1980 ish) I was involved in what were known at the 
time as Microcomputer Terminals. These were Z80 based machines running CP/M 
which used serial Terminals (VDU's) for I/O. We created some software which 
required custom key caps so I (as the junior!) was sent off with a bag of 
blank keys down to a local company who engraved lettering into the surface 
of the keys which was then filled with some white paint - et voila - 
customised keycaps.
Wind the clock forward 40 years (that's scary!) and things like cnc routers 
are more common place - I have a desktop CNC router myself and I can see 
that it would be no major issue to cut letters and words into the surface 
of a blank key. 
Assuming one had or had access to a small router, that would be a way of 
achieving your goal.
Just my 2 cents as they say!
Richard


On Wednesday, 15 January 2020 15:46:10 UTC, newxito wrote:
>
> The 14 neons for the dots and minus sign are now installed and everything 
> seems to work fine. The board with the switches is also fully assembled, it 
> uses a HT16K33. I will start with this keyboard layout. I have to start now 
> designing the case, that’s the hardest part of this project. If the case 
> looks ok, I probably will design a new board with more keys and functions 
> and buy some custom keycaps. By the way, custom keycaps seem to be really 
> expensive! 
>
>

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