Hi Steven,
as LDS is in large parts free-mansory, I think you will never be able to fully understand them. Especially what’s going on in the temple and what this “progression” means you mentioned. (which in my opinion has to do with Apotheosis, which is typical for freemansory thinking)
The only way to fully embrace these “secrets” are when you really become a LDS in a priesthood (because without, you are not even allowed to enter the Temple(s)!)
That’s the reason why I stopped searching about LDS and concentrated on RLDS, you know? And also because they are not really Christian in my opinion.
Regarding advertising the Bible in LDS commercials (I, by the way, have never seen so far. But I guess this is because I am not in the US):
[But the idea is good. The LDS KJV Version is full of crossreferences to the BoM, the PoGP and the D&C {as are all their books}.
Because this is how I got interested and bought myself the Triple Combination /after seeing the cross references in the BoM, in this case./ of the Holy Scriptures of the LDS! And slipped deeper and deeper into Mormonism. And if mom wouldn’t have hidden the Triple Combination, I guess I would’ve become a Mormon…
I simply wanted to know what these other scriptures are about. There was really a time, I quite thorougly studied ALL LDS Scriptures (without the History of the Church).
So you can say what you can get to know without being a priest in the LDS Church, I am quite well informed.

]
When you meet Mormons on the Street (and they are on the Streets here in Austria, too - even Americans, which can speak really good German, normally!), and they have talked to you for a while and have the feeling you are interested, they will give you a BoM Copy and not a Bible for free! (This is what happened to me!°)
Esdra