Default How Do Modify an Icon Pack

I've been using DCiconZ for quite a while, and I recently learned that the template was publicly available, and started the king apps that hasn't been done yet. Just now, I downloaded Union, because I liked the idea of the theme being universal. However, as they aren't actually part of the icon pack, simply PNGs that I manually set to be the icons defaults, Unicon doesn't recognize them, and uses the default theme for them. Anyone know how I can modify the icon pack to include my updates?

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