I've finally sussed out how to make this guy, er, "appear". Here's how:

1. Start a single player game using bot_minplayers and play to the end of the round.
2. When the final score table appears, pause the game using [ESC] and then pull down the console.
3. Type \kick all and press [ENTER].
4. Now type map xxx where xxx is the name of the map you want and press [ENTER}.
5. Voila! You should now have something like this: