You could use a text frame that's anchored in the header / footer. This way, you can place content on the same place on every page while that content doesn't need to keep inside the header / footer margins.
To do so, just activate header or footer, place the cursor inside it and select Menu Insert
-> Frame
. To keep the main page content apart from the "right column", just set the right page margin appropriately.
If the content that should appear in the "right column" is non-textual, you could also try to implement it as background image of the header / footer. AFAIK background images in header / footer aren't restricted to the header / footer area.