Um, the second shot IS centered, the third is not. When you add the additional text you are changing the length of the line so the center point moves. If you don't want those extras glyphs to affect the centering, then I guess you need to do what you show in shot # 3.
I do not what the glyph to affect the centering. I need the copy itself (no glyphs) centered.
Then you have your answer. I'd make those extra frames custom positioned anchored objects, myself -- the anchors have no width.