Activate carbon will do little just sitting in the bag. It must have water forced through it (preferably under high pressure) to remove much ammonium. Ammonia chips (Ammo Carb, for example) are the same.
Please note that Bag Buddies were designed for getting fish home from the store, and not for long-term exposure like with Ship Right.
To use with the 50-60cc of water in a breather bag, it would seem essential to dissolve the tablet in a gallon of water and then use the water. That may defeat such things as oxygen release, but that is certainly not wanted in a breather bag, anyway. Just my biased US$0.02.
Wright
01 760 872-3995
805 Valley West Circle
Bishop, CA 93514 USA
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