hello all. facing a usability question here - trying to figure this out...

i've created a dataobject called RelatedPages, and it's added as a gridfield to our blog/article/resources pages. it's sole purpose is to link to a related page, and pull content accordingly. It uses the SiteTree property in the array.

The problem is when some pages get decommissioned, i have to manually go through and reset the relatedpage for every page that linked to the decommissioned page. what i'm looking for is functionality similar to DependentPages, wherein a page will display *all* links to said page, not just from Redirectors or content links.

However, this function is buried in SiteTree.php, so I'm apprehensive. How best to move forward with this? Is there a module? Googling "DependentPages dataobject" yielded nothing.