“Yes, I’m proposing that Shalom Bayis is more important (as far as HKBH is concerned, not “frumkeit” or “Charaidism”) than Tznius. Prove to me that I’m wrong.”
You completely distorted the gemara. The gemara tells us that shalom is so great that hashem allows his name to be erased. It says nothing about the fact that he allows a pritzus situation to facilitate shalom. In fact, the stated reason for “uncovering” (see Rashi on the word pura) her hair has nothing to do with shalom, rather it is to shame and rebuke her.