Hi Mike
The easiest way to fix this is to create a custom "page export" button that uses a custom sort order.
Create a new tiddler called $:/my-page-export with the tag $:/tags/PageControls. Add a description field containing "my custom export". Add the following content to the text field:
<$macrocall $name="exportButton" exportFilter="HelloThere GettingStarted [!is[system]!title[HelloThere]!title[GettingStarted]sort[title]] " lingoBase="$:/language/Buttons/ExportPage/"/>
In the example, HelloThere and GettingStarted will appear at the top, followed by the remainder in alphabetical order. You'll see that each tiddler name needs to be repeated in the filter.
Best wishes
Jeremy.