The only thing I think is that you're overcomplicating this whole process to no end...
If you can't afford BCAAs, you can't afford them. I use them and I recommend them as a staple, as leucine is the synthesis trigger. Every wonder why people start gaining muscle almost as soon as they start using whey? I'll give you a hint - it isn't totally due to the caloric increase. Whey has a very high concentration of BCAAs.
I've mentioned it before: with all other things staying the same, I've administered mass doses of BCAAs to high level athletes without altering their training or other parts of the diet and have seen them add as much as 9-14lbs of muscle in one month. These aren't just amateur gym rats, but people that are at the high end of the athletic and genetic spectrum. If it works for them, it will work for you.
Food is your most important substance. Most people that are trying to do HIIT aren't at the physical level to even be doing it. It isn't really going to be extremely effective for a beginner IMO - it isn't to be used to replace slower cardio. The ping it puts on your CNS will lead to OTS quite quick if you aren't conditioned. Evaluate your training history and your needs and determine if you should be HIITing. I can't answer these questions for you because in reality, I know nothing about you, your experience or your goals.
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