"exec" only works for executing cfg files.
I'm not sure if you can do it with a console. Maybe if you have the cfg file with all your binds somewhere on your computer, and bind one key to execute that cfg file. This might work, but I don't use consoles. So someone can test.
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Actually I might test it myself on VMware later on, since nunya released a console.
What I mean by later on is maybe later tonight or tomorrow some time.