I hope that eventually the price will come down like PC boards have, to where they're quite practical now for hobbyists to get their own made. Just imagine double (or triple)-shot keys, and bezels with rectangular cutouts, and lexan overlays, all with set-up costs that are just pocket change, so you could do this kind of thing very inexpensively:
The keys on that thing have a wonderful feel, BTW! This hand-held computer was way, way ahead of its time when it came out in the 80's. I have two of them.
Although I'm not really fond of rubber keypads, it would be nice if those would also get to where you could get them made with very low NRE.
A neat thing about lexan overlays, which we took advantage of in one of our products is that you can have dead-front panels, meaning you can have annunciators that are pretty much invisible until a bright LED turns on behind, then the letters pop out of the black. We did that because this aircraft intercom had features and annunciators that might not apply in all aircraft, and it would seem kind of silly to have lights that never came on for certain aircraft. The way we did it, the pilot or aircraft owner wouldn't even need to know it was there if those modes were not applicable in his case. The lexan panels also allow tactile or smooth buttons. These are not suitable for typing, but they're good for some situations where you want to keep contaminants out of the key switches (like a machine shop with all the metal shavings and cutting oil) and just clean the keypad with a damp rag, even spraying it with a cleaner if necessary. The panel can also have a window for a display, protecting it from contaminants too.