Sorry to hear about the broken wrist. Been there done that. Ended up getting a proximal row carpectomy (where they take out 2 bones in your wrist). Pass on that if they offer it as a solution. My wrist is as bad now as it was when broken and there is no way to go back.
As far as feeding, I've used Dyna Gro Foliage Pro (a complete 1 part fertilizer with all the macro and micro nutrients) for several years. It's inexpensive. It's not "natural" but I don't think what you were planning on feeding them is either. You can use the same product from start to finish. It cuts down on costs a lot from not having to have a bunch of different products. I'm not quite sure how it will work with the chicken manure. I normally feed it at a rate of 1/4 tsp for week 1, 1/2 tsp week 2, 3/4 tsp week 3, and 1 tsp per gallon for week 4 and beyond, and I feed every watering. I suppose if I was using it in conjunction with a soil or Coco ammended with some sort of fertilizer (like your chicken poo). I'd probably do the 1/4 or 1/2 and let the plant tell me if it wanted more. Just throwing it out there for what it's worth.