An ePub file is nothing but a ZIP file containing the contents of the ePub. toc.ncx is a file that defines the external ToC. So you extract the file toc.ncx from the ePub and then using a text editor, you can remove the anchors. I use Notepad++ which is a free editor because it supports tabs, loading of multiple files, and regular expression for easily removing the anchors. Then when the anchors are gone and the file saved, just put tit back into the ePub in place of the one there and done.
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