See How to set the "tab order" of a Word Form by Dave Rado, MVP and Mark Tangard

Thanks, I'm familiar with that link, but unfortunately, that is not an option - I cannot use Macros in this form, and the issues that apply to the macro method are not acceptable even if I was able to use them.

I have found that the tab order seems to match the order of the Bookmarks when ordered by 'Location'. Unfortunately, there is no way to change the order of the bookmarks that I have found. I'm going to have to see if I can try editing the document's XML to see if that will re-order the bookmarks. I tried deleting all bookmarks and re-creating them, but they revert to the order that I currently am stuck with.

This is why I hate working with Microsoft products.