First, this wasn't intended as a tech. Rather a simple illustration of of traditional opium processing, as this is practical only when dealing with large quantities of opium. Mostly it was to get people thinking in the right direction so that they may formulate their own processing procedures. Second, morphine HCl is stable up to 121 deg (c) in an inert atmosphere for 180 minutes with an adjusted pH of 2.3. This translates to 249 deg (f). If this method were to be used, conversion to a hydrochloride salt is very simple. Also, with the use of an oxygen scavenger in solution, I believe that this process could be performed successfully in one's home kitchen, even without an inert atmosphere. Would it yield USP grade opium extract? Probably not, but it would certainly be usable and free from major impurities. In the study where these figures were sourced, one batch was tested with a solution of H2O2 added to facilitate breakdown. Even in this instance, losses did not exceed 20% of the original morphine content. I'm not sure what you consider acceptable, but 80% is at the very least respectable. I have not tried this, but I would expect, given these figures, that the aforementioned process is in fact a viable one. Even, if you are using freebase materials without any chemical modification.
Now, if dealing with small quantities of opium (under say, 500g), all this would seem unnecessary as high proof ethanol or isopropanol would facilitate filtration with much less hassle, less loss, and faster drying times. Also, whenever I post anything regarding opium, unless I stated otherwise, I am referring to latex only, not straw. If you must use dried pods or other byproducts of poppy production, there are additional porcedures to be followed.