There’s a lot of folks on the forum who have asked about working out on the diet and it would be best if you could not work out for a few weeks until you get your legs underneath you; fighting candida early on can be particularly taxing (as you can see now) and you need every ounce of strength from your immune system in order to get better. If you can reduce working out even more, you might find more benefit.
You likely are getting a reaction to non-organic chicken because it contains antibiotics and/or hormones which are not beneficial to your treatment. I still eat non-organic chicken but it is antibiotic and hormone free (free range chicken) and this is good enough. I used to react to the low grade sysco chicken at my cafe at work and have stopped eating it because it is no good.
I think your food reintroduction timeline is sufficient and I would give it a go. You need to introduce each food seperately so that you can be aware of any changes to how you feel (allergies, etc). I would even consider trying some of these out sooner (this week).
Brown rice is something you should not eat every day on the diet and I would look at it as a cheat food item. It is very high in starch and contains low amounts of sugar. A great alternative would be buckwheat which has a similar texture and flavor, but only 25% starch.
Oat bran can be introduced when you are ready like the others you mentioned.
Hazelnut milk is stage 2, same with crispbread if it has slightly bad ingredients. The coconut milk is something I would try out stage 2 as well, I was slightly allergic to it myself.
It can take as long as 6-18 months to fully recover from candida overgrowth and I didn’t start stage 2 until 9 months into my treatment. I’ve been on the diet for about 1 year and just recently cheated badly for one week on my honeymoon. I am healthy enough to handle it I guess, but it did cause some seizures due to the sugar and white flour.