I'll say it again. The BPs have >never< been part of the MC. If you would like to add any usefull info to the discussion then you should address the concerns in the link I pointed to rather than just saying it's OK to do it with nothing to back it up.
The guy who came up with the so called original Ultimate Cleanse simply did not have an understanding of how the BPs work as he recomended that you mix the lemonade with the B&P and anyone familiar twith the B&Ps knows that one should not take any nutrition or anything else within one hour of doing the BPs because of the highly absorbtive nature of the B&P. Futher more he does not even mention the need foro drinking lots more water which is a crucial essential point of the BPs working properly. All these facts makes it quite obvious that the guy that came up with the UC was not very well informed and did not have a well thought out plan at all . The BPs are very effective and they can and should be done while eating regular.
Besides all the reasons in the link I posted there is the issue of how the MC works by giving the digestive system a rest and when you take all that fiber it will crank up the peristaltic action to move the fiber out. Last but not least Andreas Morritz advices against the B during fasting as it has the potential of becoming plaster like and really gum up the works.
You did mention the posibility of some folks not being able to tolerate the extra toxins from the parasite die off. Even if lets say that someone could tolerate the extra toxins without getting sick you are still interfering with the MC cleasing by adding all the extra toxins. Also most parasite tinctures contain alcohol which the body will treat as a poison during a fast. Add to all this the body having to digest and deal with the herbs from the parasite tincture again being counter productive to the MCs main MO of giving the digestive system a rest.
This Ultimate Cleanse thing stems from the classic middle of the road "drone mentally" of wanting to have the Magic Pill do all be all and that just simply does not exist........It takes education focus and most of all >>>time<<<< to deal with a lifetimes worth of accumulated toxins. There simply ain't no short cuts.
The MC is a very simple elegant and highly effective cleanse as is. If it ain't broke don't fix it..........