An encapsulated plugin can provide the default template for any
added page, but cannot (currently) override the template for any base Zen Cart page (e.g. account, in your example).
Dealing with those base pages' additions by encapsulated plugins depend on the presence of notifications within those template modules (and there aren't man7!). You could use what I did with the How Did You Hear About Us (
https://www.zen-cart.com/downloads.php?do=file&id=90) plugin, which provided a combination of a default template for its added page and the use of jQuery/javascript to inject any changes to built-in pages' templates.
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