Yep. All of what you describe is possible, but its not "airtight". It would surely leave so many potential "leaks" in the plan, that the risk of discovery would be unacceptably high.
A few years ago there was an interesting discussion about his type of thing where people with expertise in many of the Apollo-related subjects discussed how they would attempt to pull off a convincing moonlanding hoax. Some thought it was simply impossible and others said the same as you have, "Possible, but unlikely it could be done that way without being detected." IIRC few came up with a plan that would really work, or if they did, the expense and/or difficulty would be so high that it would have been cheaper and easier to just go to the moon.
I don't recall exactly where the discusssion was and would like to see it again. It may have been at the old Bad Astronomy Bulletin Board or in the early days of the BAUT forum, and if so the thread might still be around at CosmoQuest.
My expertise is photography, and while there was much I had to learn about Apollo and the equipment and techniques used, I eventually come to my own conclusion that the photographs were not faked and could not have been faked. In one or two cases it was only my experience as a photographer in the 1970s that helped me solve, in online discussions, some of the "mysteries" of lunar surface photos, because of the ways things were done back then but are not done now.
Many examples of this can be seen in Michael Light's Book "Full Moon." If you compare the colour photos with the black-and-whites, the latter are of poor quality. The dark lunar sky or dark shadows on the moon bleed into the greys and whites. It even shows on the dust-jacket photo, where the entire limb of the moon is shaded.
What happened? There are a few possible explanations, all revolving around the darkroom printer's methods of working. I settled on the the most amusing one: "He smoked in his darkroom."
In that case, a fog of smoke might have a small effect on the beam of light from the enlarging lens to the paper, but it's more likely that the smoke would have, over time, coated the enlarger lens, causing it to lose contrast and with a soft-focus effect, spread the most light from its beam into areas it shouldn't. (We're talking negatives here, so the most light comes through the unexposed areas such as lunar sky, and turns the paper black when developed.)
Other possibilities are that the enlarger lens was just plain dirty from fingerprints, or the printer did the same dumb thing I did when I was a new, naive printer. For far too long I was getting that same edge fog on my prints, and couldn't figure why. I smoked back then, but not in the darkroom, although it was okay to briefly carry a lit cigarette into the darkroom because its glow didn't fog paper. I had checked.
After much detective work, I finally looked inside the lens with a light behind it, and saw a thin film over the surface of one internal lens element. Immediately I knew what it was. Months before, that lens had developed a squeak when I changed the aperture, so I lightly oiled it. A no-no. The squeak went away, but the heat of the enlarger bulb had, over time, partially evaporated the oil which caused it to coat the internal surfaces.