We really appreciate your efforts of going through the whole VK manual and list down all possible solution.
This reminded me of article by @"Puneet-Certified VK Teacher" for possible solutions for headache with VK.
One day Sharat Sir posted this question to Team VK how will you heal headache with VK.
And Puneet replied in detail. His answer was published as an article on litairian. Must read it.
https://www.litairian.com/possibilities-headache/
GOLDEN SUNRISE to all your efforts !!