I totally understand your issue. The bad news is that 6.2 is done, so we can't modify it anymore.
Now let's focus on solutions! The good news is that this has been implemented as a taglib and it is really easy to use.
If you go to https://github.com/liferay/liferay-portal/blob/master/portal-web/docroot/html/portlet/blogs/view_entry_content.jsp#L173 for reference on how this is used on blogs, you can see that this pattern can also be applied to web content display or asset publisher portlets easily using a hook.
On the hook you just extend the JSP that is showing the content with a div element and the input-editor, like we do on blogs, but checking that the asset is a basic web content.
Moreover, you can release this simple hook to the marketplace and earn a place on the community contributors heaven
Please tell me if you need more info to achieve this
ps: see you at the Italy symposium?