Is direct magic strictly speaking necessary?
It's cool, but novel research into empowering people sounds very difficult.
It sounds like the current human mechanism for enchantment involved the use of dragonstone dust for everything, or at least key power components. Presumably the rune work Ryza's father used didn't.
Figuring out how to make a rune based tool for producing more runes sounds a lot less complicated even if it'd still be difficult.
From that point, assuming I understand how the system works correctly, they could shift from free from magic to manufacturing purpose built magitech. Which would be a bit rough, but could have it's own advantages.
Even if I'm wrong on my base assumption here I think it's worth looking at the problem from the perspective of solving the problems magic is currently used to solve instead of trying to replicate the exact system currently in place by different means.