It's not entirely clear, how to bind in KDE an external program without KDE support on a keyboard shortcut, the "System Settings -> Keyboard & Mouse -> Keyboard Shortcuts" has no such option.
You have to start "kcontrol", go to "Regional & Accessibility" and choose "Input Actions". There you can create a new entry with "New Action". For the "Action type" field you have to select "Keyboard shortcut -> Command/URL (simple)". The second tab now let's you select the keyboard sequence, in the third tab you can enter the commandline program with options. Don't forget to apply the changes!