Note: This is not an attempt to answer the poster's original question. Rather, it's a brief look at the background of the phrase "how sausage is made." I include it here because it may interest readers who are unfamiliar with metaphorical use of the phrase and because the phrase's origin hasn't come up elsewhere on EL&U.
The origin of the "how sausage gets made" idiom may be the proverb/quotation, "Laws are like sausages. It's better not to see them being made." The Quote Investigator has an interesting discussion of the origin of this phrase, which dates back at least as far as 1869, under the heading Laws are Like Sausages. Better Not to See Them Being Made. Evidently the phrase is frequently (though probably erroneously) attributed to Otto von Bismarck.
Another once-familiar expression that trades on the dubiousness of the ingredients that may go into sausage appears in volume 23 of the Pacific Monthly (1910):
Reminded me of our maxim of the pig: "Use everything and make sausage of the rest."
I was surprised to find, however, that Google Books references in a general metaphorical sense to "how sausage is made" are exceedingly infrequent (in fact, virtually nonexistent) before about 1989, when this example, reported in Mary Price, "Setting the legal information agenda for the year 2000," Law Library Journal 81(2), was published:
Ms. Vincent-Daviss: Well, how do you feel about librarians making all kinds of decisions that affect the format that you're going to use without asking?
Mr. Terry Martin: He's a consumer of hot dogs. What does he care how the sausage is made?
Ms. Vincent-Daviss: It's not how the sausage is made. It's what kind of sausage it is.
More-recent instances seem to assume a familiarity with the historically unpleasant associations of sausage making, as in this extract from Silvio Waisbord, Watchdog Journalism in South America (2000):
It shows us how political sausage is made but reveals little (if anything) about how news sausage is made. And the making of news sausages is closely linked to the "politics by other means" that are increasingly dominant in South American democracies.
(I'm fairly sure that the "closely linked" language in this last quotation is not an intentional pun.)