That wouldn't work. Not all Catches can be bypassed with potions. Furthermore, you won't always have an appropriate potion.
Not sure why people are so keen to avoid the current version of this item. Could someone explain?
I'm not saying that it would be potions carried around. Only that it would use similar mechanics to wizards using potions.
Once a specific Catch has been determined, one of the "potion" slots can be filled with a clip of bullets specifically crafted to mimic that Catch. These bullets are runic, or mystical in nature. That means that the magic of the bullet mimics the Catch, and is not limited to mimicking Catches that are bypassed by specific physical materials. Also, this version requires the Catch to be researched or discovered, since each clip must be crafted specifically. You may not always have the appropriate clip on hand if you get caught by surprise by something you didn't expect, but that is a chance you take.