Now I follow you, and yes you can do it. It's a bit complex, but here's the steps:
- Take the parent Template, and clone it (set the CodeName to something like "Parent_Widget_Zone_Only_Template")
- In that cloned template, remove EVERYTHING except the webpart zone that is the 'widget zone', this includes the HTML around this in the Layout. There should only be the WebpartZone control in the layout.
- In that cloned template's General options, set it to NOT inherit anything (no master page).
- On the child page, insert a Page placeholder webpart
- Set the path to the parent, and the Page Template to your stripped clone template (Parent_Widget_Zone_Only_Template).
HOW THIS WORKS:
The page placeholder can pull in and render a page, using a given template. Normally it shows child pages, but you can specify the page (parent), which then will render that page's content given the template.
The cloned, stripped template will only contain the widget's webpart zone of the parent, and no inheritance, so it will only render the content in there (the parent widgets).
Final Note: If you need this in a widget format, you can create a widget from the Page placeholder as you would create any widget.