This is a bit of an odd request but are physical key covers a thing? I seem to remember using a blank one in elementary school to learn typing.
For example, I'm looking to learn bulgarian but I'd like something to lay over my keys so that when I look down I can see the bulgarian phonetic layout on my qwerty keyboard but then if I need to go back to US QWERTY I can just peel it off the keyboard (and switch modes in windows)
Boosts are welcome.
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@Yarideki kb covers has a bunch but not bulgarian
http://kbcovers.com/languages/
you can always get it custom made if you have 49 friends who want one too (or want to sell the extras)
https://www.thekeycuts.com/shop/custom-keyboard-covers/
@Yarideki looks like you can get custom made ones much cheaper, too:
https://www.alibaba.com/product-detail/custom-silicone-keyboard-cover-glow-in_60670615567.html?spm=a2700.galleryofferlist.normalList.12.9dea6404H0zMcR&s=p
still minimum order of 100 though