You might find out this world overlaps with gamers and novelty mechanical keyboard people. Check out a search like "mechanical keycaps custom artwork", eg here's one - http://www.maxkeyboard.com/custom-art-icon-or-text-cherry-mx...

Maybe give these guys a ring and see if they can recommend who they work with for non-Latin caps: https://mechanicalkeyboards.com

And also hang out on https://www.reddit.com/r/keyboards and /mechanicalkeyboards.