You have two methods:

Method A (Interactive):

Key Definition Utility v2.3 (v0611 compatible)
Enter key string > DEF0611-9G7H-2J4L-8M3N-6P9Q

Method B (Batch/Silent):

keyctl --define --install --keyfile=/opt/keys/v0611_siteA.key --quiet

Defining keys in the software does not change the keyboard until you "Write" the data to the hardware.

Once installed, launching the Key-Define application will present a visual representation of a keyboard.