is it possible - through a plug-in, MT hack or other magic - to rebuild just one specific "individual entry archive" page, when the comments have been edited?

we update comments often; and then to rebuild 'individual archives'... with the number of posts growing, this gets to be a lengthy process.

any suggestions appreciated!

If you are editing/deleting comments, you can simply re-save that particularly entry after making your changes, and the necessary pages will be rebuilt. You don't actually need to rebuild all of the site.

Saving the entry works like a charm, but it will update the entry's modified_on date (which in most cases doesn't matter, though).

If you use this Rebuild Entry hack, the modified_on date of your entry won't be changed.