@chrisgagner,
I do not know whether your hunt for a drip-feeding plugin has been successful or not, but the plugin at DripFeedManager.com will do your job perfectly. If you are still looking, reach out to me and I will let you have complimentary copy in return for an appraisal.
@Robin W
Thank you for the mention of DripFeedManager’s existence. Your description however is sincerely lacking in an ability to read the description on the site, as it actually states that
This plugin will only display posts to logged in readers who have been members for the specific time the post is protected for
There is absolutely no way that just changing the post date will do that!
