I see the link you put in your post is the same one that I put in my reply. My operating system is Windows 8.1. Here is a link to my post on this issue. Since you mentioned that you may be able to find a way for our printers to use custom paper sizes, I hope that you are able to point us in the right direction.
Thanks
-Eggz
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Zorilla,
Give my post a read. It will save you time to see what has already been tried. I did everything I could by reasearching here and other forums before posting. Reading my post will prevent you from trying things that have already been proven to not work.
-Eggz