why not just make a strong batch and take less when less strenght is desired? makes matters more simple I guess

I guess the most important about all of your plan is your devotion/positive intentions. This can bring about very good experiences. If you wish so, then do it.

I personally dont know if the dieta has something 'physical' about its actions and if it 'detoxes', or if it's more like any sudden change in our habits, that by the contrast to our usual behaviour puts us in another perspective or temporary state of awareness (just like many ancient religions/groups used some kind of 'shock' to bring the person to the present moment, like the zen riddles or the fakhir self-mortification, etc etc).

Maybe one thing that the dieta means also is because in general people eat very bad, loads of oil sugar salt, and this indeed is not healthy. So by adhering to a more moderate diet, it also gives one more respect to the body or something of the kind. But personally I feel that one shouldnt make a 'dieta' for these experiences and then exagerating/eating bad after..  Its all about always eating good, fresh stuff. In this way I personally dont feel like a dieta is my way, but I do know that it might be for some people, so I have respect for that. So as I said do as you feel, with good intentions and respect to your body.