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What if the Miracle Box came with another function or item to help protect it? What if that is a set of armor that has the power to use some of the power of each Miraculous?
Basically, in this prompt, Master Fu doesn't just send the Ladybug and Black Cat Miraculous out. He also activates a set of armor that the Guardians developed to protect the Miraculous and their wielder. This armor has absorbed magic from each Miraculous to use their powers, likely to a lesser degree, at least once per transformation.
So, now. Not only do we have Ladybug and Cat Noir, but someone meant to protect them and the Miraculous using the power of other Miraculous. For possible limits to this armor, you can prevent it from using the Ladybug and Black Cat. You could take it a step further by making it so the armor can only use Zodiac powers.
For who wields the armor, you could make an oc that's the assistant and Guardian-in-training to Master Fu. Maybe have Kagami or Luka appear early or bring Fei into the plot somehow. You could even make it so the armor is sentient and is just trying to learn about the modern world. Of course, it could also act like a Kwami for whoever wears it since it absorbed the magic energy of the Miraculous to gain its powers.