Possible to obtain 100% spell reduction?

I already know how to do so with regular enchantments. What I want to know is if it's possible to do something like, for example, take the enchantment off of the Diadem of the Savant or Arch-Mage Robes, and apply it to an item. The only issue I've found is when you do get mods that make you able to disenchant them you're only allowed to increase 1 part of it.

For example, I once was able to disenchant the Diadem of the Savant, but when I put it on something it would come out as Alteration, Conjuration, Destruction, ect, 5% reduced and not simply All spells 5% reduced. And when you use a potion to try and increase it only the first one is made better and not the rest, which would come out as Alteration 100%, Conjuration 5%, Destruction 5% reduced. If I wanted to have each individual enchantment to be fully off I would do so.

What I'm trying to put down is this, why is it not possible to simply have a all spells reduced option and make it scalable instead of what I listed above? Is it some limitation with the Creation Kit or what?
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Son, Vespa's are like fat girls, they're fun to ride but you don't want your friends to see you on one.--My dad

@Megawizard

You get the idea though.

@Tia_Le_Re

I have little clue on what I would be doing with the Creation Kit, not only on making an enchantment that does 100% off all spells, but also possibly making scalable, how to add it to the character to use, and other things that I can't think of. I'm pretty much new when it comes to the Creation Kit and I have little clue on how to work it.
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Son, Vespa's are like fat girls, they're fun to ride but you don't want your friends to see you on one.--My dad