Modify Physical Keyboard

Sometimes the keyboard that was provided with a device cannot be replaced, or is generally usable, and needs some modification to be fully accessible.  The most common types of keyboard modification are:

• Adding expanded, tactile or higher contrast labels to keys to make their function more clear.
• Adding a mechanical barrier (keyguard) to make it harder to accidentally press the wrong key while typing.

What type of add-on are you looking for?