Ability to assign page to specific widget?

I have searched extensively through over 1000 plug-ins and cannot find this.

Is there as plug-in which will allow me to, in Page Editing, assign a page to a specific widget enabled in Appearance/Widgets, thereby eliminating the need to edit every widget but one to exclude that page? I know there is FlexiPages Widget but that still requires the editing of every widget to include/exclude pages.

Better yet, where I’m really going with this is… I have enabled the plug-in Capability Manager so that any user who registers has the ability to create and manage only their own page. However, I want all members pages of that user group to be contained under one specific widget, so the ability to assign a default page widget to a specific user group and have that selection option in Page Editing would be ideal.

Basically this would be similar to Categories for Pages but assigned by User instead of Category. This would give the admin control of where users post pages as opposed to the User choosing.

Any ideas?