Inherit components in SPA without placing them in editable templates

Hello, guys,

my colleagues and I are implementing a SPA application using AEM and Angular.

The decision we are currently facing is the following: where can we insert specific components so that they appear in more than one page (always in the same spot) without using the templates?

Components like these are the header, the footer, plus a bunch of other components specific for our SPA.

Previously, in the implementation that did not rely on Angular (and that was heavily server-side rendered), we would insert these components as:

 inside the HTML of the structure used by the templates of the pages we wanted to have the component.

So that, for example, our editors could go to the homepage, where they'd find the header-component  and then configure it.

And the changes would propagate everywhere in the pages using the template, using the structure where the previous HTML was inserted.

Sadly, we are now restrictred to not use the structure of the editable templates much like we did before, because they are common between various SPA applications that have different specifics.

The obvious option would have been to place those components in the various implementations of editable templates used by our pages.
Unfortunately, our editors do not have access to the editable templates' console (/libs/wcm/core/content/sites/templates.html/conf) and, quite frankly, when suggested they did, refused to have access to it.

So basically we cannot place - for as I see it - the components: 1) in the structures, because those are shared by too many applications (and we are restricted in creating more); 2) and we cannot place them in the editable templates, because our editors won't access the console that would allow them to edit the components (such as the header).

Is there an option - somewhat AEM compliant, or that you would find advisable - to allow our editors to edit the components (say, the header or the footer) in a centralized way within the Sites console (so from /editor.html/content/path/to/page) and have those changes apply to those components across the site, without having to re-include/configure those components in every page?

We are also exploring the possibility of using Angular as aid, to inherit the components, but we see no way of allowing our editors to retain full customizability.

My team and I would immensly appreciate any input or idea you are willing to offer.

And as always, thank you guys for you contribution,

Parag Dalal.