The problem is, your assuming that your customer has the BlackBerry JDE installed and has access to JavaLoader. I would do something simple like create a zip file with everything they need. The zip file would contain your COD file, JavaLoader.exe, and a batch file for the customer to execute.
My batch file would look something like this, nothing fancy.
Code:
@ECHO OFF
javaloader -usb load $your_app.cod
PAUSE
EXIT