Sam91, that was a very well-written and well-thought-out post. While I agree with much of it, I have been an unabashed advocate for innocent non-sexual nudity most of my life, for those desiring it, while trying to not offend those who don't.
In Ezekiel 16, the baby/girl/woman represents Israel, whom God adopted as a helpless infant, raised and nurtured to adulthood, and married, only to suffer from Israel's "adulterous" relationships with other nations (consisting mostly of idol worship). In verses 7-9 the young woman's nudity is described in terms of beauty, not shame. Some versions of the NIV have the phrase "You grew up and developed and became the most beautiful of jewels" in verse 7. In verse 8 when God "spread the corner of His garment" over her to cover her nakedness, it's not because her nakedness was shameful, it was God claiming her as His bride (the "covering the nakedness" idiom, referring to sex). The phrase "uncover the nakedness of" is an old euphemism for "have sexual intercourse with", much as we say "sleep with" today.
Her adultery begins in verse 15, and the references to nakedness after that point are indeed shameful, as they should be.
With Adam and Eve, Genesis describes their first emotion after eating the fruit as "fear", not "shame". Of course, both are understandable, since they had just disobeyed God, whom they knew "face to face", and were tricked by a serpent! They, not God, had a problem with their nakedness. He was so unconcerned with it that He asked Adam: "Who told you that you were naked?" In other words, "why are you giving me a lame excuse like that for hiding from me?" God replaced their flimsy fig-leaf aprons with fur garments to protect them from the "thorns and thistles", cold, abrasion, and wild animals they would encounter in the now-fallen world. Clothes were their idea. not God's.
We are all blessed to be clothed by God, but the only clothing that really counts is the Righteousness of Christ.
Regarding being nude as "A trickery of the age", perhaps my words sound like the serpent in the garden. I hope not, but I can understand if you have your doubts.
I wish you could meet my two sons, who were raised as both Christians and nudists, and find no conflict between the two. They are in their 20s now, both are still virgins, and they have no desire to look at porn (in fact, they avoid it totally). We would not have raised them as nudists if it were not a Godly and healthful environment.
I know it's very difficult (maybe impossible) to imagine being nude with 200 other nude people and not having it be a "strip club" environment. But it is possible, and happens every day. Being a Christian helps a lot, but even most non-Christians behave themselves, once they understand that sex is "off the table" and will not be considered in this setting. The rules for good behavior are the same, whether nude or clothed.
I don't expect any of this to change your mind, but I wanted to explain my perspective, hopefully as well as you explained yours.