Provided the plugin still works, this should do what you want to do #57.
However, since all you want to do is swap huds you can do it manually very easily. Because tf2 only looks for the core directories two levels into custom/, you can effectively remove custom files by placing them one level deeper into custom/.
Therefore, you can make an extra folder in custom/ called "disabled", and move whatever hud you don't want to use into that directory, leaving the hud you wish to use in custom/. Then you can just cut and paste the hud (from custom/disabled/ to custom/ and vice versa) when you want to swap them.
Path to used hud: tf/custom/HUD/
Path to disabled hud: tf/custom/disabled/HUD/