Hello, while i dont have it yet, if you would like to listen to my limited knowledge about the tapasya and how it can be used. The other month i was curious about it, its a nice concept for sure.
So all that you read, it can be applied to wide range of circumstances and lifestyle, as just said above.
One of these would be the practice presented in Light od the Savitur (which is ofc automated)
So basically if you read the following again for what Tapasya does.
“This is done through exposing yourself to discomfort or self denial with which we break free from the bondage of desires, attachments, and develop a inner strength, peace, purity, awareness, detachment, gaining control over mind and senses and developing a strong willpower to go through any obstacles.”
You should see that it should help you on your path of Savitur, with the concepts above.
Note that this is just how I view it at this point, could be anything else as well, perhaps more complex applications of it, who knows!