https://forums.alliedmods.net/showthread.php?p=1747762
For those too lazy to read, this plug-in allows you to use a custom loadout even when the item server is down or any other time you can't access your normal loadout. From what I've read, it uses TF2Items to check your loadout whenever you go to a med cabinet. If you are using all stock items, it runs some sort of check, generates copies of your last known items from your loadout, and automatically equips them.
I haven't tested it out personally, but I thought it might be something worth checking out. I do know that there is no way to level up strange weapons when the item server is down, so this plug-in wouldn't fix that, but it still seems useful for actual gameplay purposes.