If you can't find another solution, you might try the tag plugin. On each page that you have an include, create a tag to that include. You can have multiple tags, one for each include on the page. The tag markup creates an internal link that opens an index listing of all the pages which have that tag. The tags cannot be dokuwiki page names, otherwise your tag links will go directly to the named page.
If you want to hide the tag list from viewers, you can use the nodisp plugin, which will remove that list from the browser based on ACL settings set in the nodisp markup. In this case, you put your tags at the bottom of the page or there may be formatting conflicts.
To see tags at work, go to http://www.mturner.org/fckgLite/
, which is an archival wiki of the editor which preceded ckgedit.