I would also add more plants if your goal is to reduce ammonia. Moss and anubias make up almost half your biomass, which are slow growers. Your sword and (s.repens?) will help. But if you add some faster growing stems that may forgo your need for a reactor. But it may not be in your plan for anymore plants. But many of us actually dose nitrates into the water to keep our plants growing. And if you ascribe to the EI method (I do), you're actually providing more nutrients than the plants need, including nitrate - with no harm to the livestock. I use purigen as well, but for a "water polisher" as opposed to pulling ammonia out. IMHO one of the biggest advantages to a planted tank is the ability to basically have no ammonia because of the presence of our plants.
Out of curiosity what is so heinous about recharging purigen? I literally just eyeball half bleach, half water without measuring.