Braille stickers are a very economical option if you want to make a bilingual Braille keyboard. These stickers can be applied to any keyboard and since they are transparent the original keys will still be clearly visible.
These Braille keyboard overlay stickers are easy to apply and won’t dry out or damage the keyboard. If you need a keyboard that can be used by blind people in addition to others these stickers will be an excellent choice. You can read more and find alternatives on the link below.