[support] How to theme an ajax wrapper file

[Scott]

I have several "wrapper" files in a module under development.  They are
essentially outside the purview of drupal and consequently I can not
think of a way to modify them within a theme.  They fetch a jason object
with curl and create an html file.  The file is then used to replace the
content of a portion of a block on a drupal page using jQuery ajax.
Although the styling can be adjusted by the theme with css, the
structure or layout cannot be.  Are there any tricks out there that
would allow these wrapper files to be themable?