Find your desktop half-life 2 icon, right click on it, go to properties, go to target and type in at the end "-console" (without quotes).
It should look something like this
"C:\Program Files\Valve\Steam\steam.exe" -applaunch 220 -console
Now whenever you start the game, it should open up with console.
edit: After rereading your posts, im not sure if thats what you meant..