Morphine in my theory is not only useful for pain and drowsiness... but also for constipation. If you plan on using the protocol without it, I'd suggest a mixture of akuamma, incarvillea sinensis, and datura-inoxia as a substitute.
I. Sinensis makes a better substitute for pain considering its 1.33 times as potent as morphine.
Akuamma and D. inoxia is good for the diarrhea as well as pain... this also is sedative.
When it comes to combining Scopolamine with strong analgesics and sedatives, you'll induce twilight sleep, due to its amnesic effects. In other words, you won't be aware of the experience.