You can put all the input widgets in a snippet. Then you have two pages, where you set editability on the Data View. In my experience, this is a very common thing in Mendix projects, where you have Entity_NewEdit pages and Entity_View pages.
This also allows you to change the contents of the control bar of the Data View: in the Entity_View page, you can add a ClosePage button, instead of the Save and Cancel buttons of the Entity_NewEdit page.