Just to answer this question I downloaded and install Free Serif's page setting program. It indeed has a DUAL MASTER PAGE feature that could handily solve your issue. Many other DTP softwares also address this need. But Word is not tuned to DTP so you may struggle to get this done and it tends to fly apart at the seams if you select a different printer.
I have a ~100 page document that needs to be formatted for a printer. Every other page has to have different margins to the extent that the "mirror margins" and the "bookfold" settings don't work under Page Setup. Other than inserting section breaks after every page, what's an easy way to do this?
Here's an example of what I need:
All pages 8.5 x 11, letter, portrait
Page 1 - T:1, B:0.8, L:0.6, R:0.6, Gutter: 0.3
Page 2 - T:1, B:0.8, L:0.5, R:0.7, Gutter: 0.4
Page 3 - same as Page 1
Page 4 - same as Page 2
Any guesses on an automated way to do this? Thanks in advance.