A rough and early concept exploring how a user might toggle the visibility of the template for the post being edited, and navigate between content / template editing in the WordPress site editing experience.
Block tools that are governed by the template are disabled, but offer an on-canvas pathway to template editing. The visuals here need more work.
In template editing context, double-clicking on any content from the post takes the user right back to content editing.
James Koster 
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