I believe the tutorial should be ok... if the methods described broke any serious rules or otherwise inconvenienced staff or others, it would have been locked a long time ago.
I would suggest adding more preset folders into the files, but albeit I'm not sure if this would work with the way the game is coded. Worth a shot at least. I'm not too intimate with the scripts, I'll admit, but I do have an alternate solution if someone else can't create one.
But you could also create a "backup" preset folder and just switch out the files as needed if that makes sense. Like, say you don't use the character that has preset 1 too often; you could cut the files within it and paste them into a different folder. Then you could put your thirteenth preset into the preset 1 folder. There wouldn't be more than 12 ACTIVE presets using this method, but you can have as many presets as you like if you swap out the different files.