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So, still my question is, how can I have the teleop node output its text in the launch window.

If with "launch window" you are referring to the terminal window in which you've started roslaunch, and you're only looking to have teleop_twist_keyboard print its stdout into that terminal window, then I believe it should be sufficient to add the output="screen" attribute to your node element.

See also the roslaunch/XML/node documentation.