You’ve admitted elsewhere that you only read the government/Establishment-sanctioned sources and studies and can’t be bothered (because the bad news would bring a crisis given the source of your funding?) to listen to competing information.
So, from your one-sided sources, would you be willing to cite the evidence you have that shedding wouldn’t be possible?
What you call "government/establishment sanctioned sources" are actually the scientific community. Many scientists work at government agencies and I use the data they provide. Some data, like all-cause mortality data, is ONLY available from the CDC. There literally is no one else who collects that data. Scientific papers published in reputable journals are catalogued at PubMed.gov, but are written by scientists all over the world who work for a variety of institutions.
The blogs written by antivax/antiscience enthusiasts are not competing sources. The only reason I have to look at a blog would be to try to find the scientific source it misused to create disinformation. This is so that I can debunk the blog.
The reasons shedding of naked spike protein is not possible are rooted in the biochemistry of proteins and human biology.
1) Humans can only breathe, cough, or sneeze out particles in the respiratory tract. Humans can only shed spike protein that is on the surface of viruses that have infected the respiratory tract.
2) When a person receives a vaccine, the vaccine components travel to the nearest lymph node(s) in the arm. Any spike protein that is temporarily made remains in the lymph node, although small quantities might escape into the circulatory system. Either way, this vaccine spike protein never reaches the epithelial cells lining the respiratory tract, so cannot physically be shed from these cells.
3) Spike protein (whether from the vaccine or on the surface of an infective virus) is not a native human protein. This is why the immune system perceives it as a foreign invader and goes into action to remove and destroy it.
4) It would be possible to synthetically manufacture and purify spike protein and then deliver it to the nasal passages. Cells of the upper respiratory tract would then destroy the protein, just as they destroy all foreign substances that you breathe.
5) For context, you consume vast quantities of foreign proteins every time you put food into your mouth. These proteins come from plants, animals, viruses, bacteria, and fungus. Protein fragments from all of those species enter your blood during the digestion of food. In addition to the hundreds of thousands of foreign proteins you consume every day, you also have trillions of protein-filled bacteria, viruses, and fungi living within your body. Are you hysterically frightened that all of their foreign proteins are in your body right now?
If you want references for the physical basis of why a vaccinated uninfected person cannot shed spike protein, I suggest you read all of the biochemistry and cell biology textbooks and medical/scientific journal articles that I had to read in college and study them until you gain a full understanding of just how proteins function, how proteins are made and destroyed in the body, and how the body reacts when it encounters a non-human protein such as the spike protein or any other pathogen protein.
Professional antivaxxers know you have not studied any science and that you are unlikely to fact-check their claims. This is how they get away with telling you bilge like the notion that people who have received a vaccine then walk around shedding spike protein forever.