I had thought about putting ammonia chips into my setup with the theory that ammo chips=less ammonia=less nitrite=less nitrate (I was having a prob with high nitrates for a long time). I was informed, and this makes sense as weel, that I would deplete the number of bacteria in the tank, and if for some reason I hadn't recharged the ammonia chips, or they "were full" , I risk ammonia poisoning for my fish.
If your pouches were to be "full" to the absorbing capacity, the same thing could theoretically happen.
IMO, in that case, the risks outweighed the benefits (or laziness) and I would just double up on my water changes until the right levels were established.
Pouches/Chips=less live bacteria (not enough food to support their #)=risk of poisoning.