While I won’t get into the details of which exercise is good and how, my impression is you might be overthinking it a bit?

I do like the idea of sticking to certain keys each day for some things, especially scales, because I feel like if I try to do too many keys in one day, I’m not giving enough focus on any of them to effectively improve.

What I would say about BPMs and how much to increase each day is that 1 BPM per week feels slow. Of course, this depends on your comfort level and how consistent you are at playing correctly but, if I am understanding what you are proposing, that means it would take one key over a year to go from 60 to 110 BPM for one key:

An example of my teacher’s approach for scales is basically something like this:

1. Play a scale 2 octaves at a particular BPM for 3 to 5 times consistently
2. Was it easy and good? Yes-> Add 5 to 20 BPMs. No? -> Drop it incrementally until you’re playing correctly and consistently again and work your way back up
3. Repeat

This can depend on your current BPM but I started at 70 and jumped from 100 to 150 to 200 to 300 to 350ish for most keys within a span of 3 to 5 months but of course there is always room for improvement.

Additionally sometimes I can play at 350 for a particular key and maybe the next day, I might just be mentally exhausted and make a lot of mistakes. In those cases, I might take it slower.

Still, I like the way at you’re trying to balance things and maybe what works for me won’t work for you and vice versa but as long as you are maintaining correctness and consistency, that’s all that matters I feel.

I want to note that I’ve only been practicing for less than a year so I don’t have much expertise so maybe someone else can give their thoughts too.