3. Short things first:
As with all things ADHD, it's more about vantage point than new techniques - I'm not saying there are'nt new techinques here to be found by you - just that the most importan one is realizing you have ADHD and that that makes your brain function in another way than the neurotypical brain.
Some things our brains have thought themselves as survival methods by living in a neurotypical diviced societity: like masking during audition and selftapes and that hyperfocus is the only way for us to be good actors...
Some things actually works different - like the DMN-/TPN (the daydream /let's get things done part of the brain).
And some things, also like with all things ADHD, is just never thought of by neurotypicals but IS very helpful for all sorts of brains - it's just 10 times more helpful or necessary for the ADHD one to function (like having an equally focused rehearsal space as the theatre room itself - Why do you think it's so much easier for most of us to work on stage??)
Enough words about what it's all about: Let's start this adventure!
Read on as if your acting career depended upon it