This is not available out of the box.
I am sure other users can share their views here.
1. Use Delivery Management, create a view for Delivery folder which will list all deliveries(Template+emails+..) and use a
2. Use an sys filter to display only templates or deliveries in edit state if you like.
This will give you a common place to see all deliveries.
Use AEM or other CMS to build the HTML for your deliveries
It's easy to manage and update. Read docs for this(a bit long setup) but recommended way.
use CMS capabilities in Adobe campaign classic version(not available in the standard) to build a new Universe for deliveries just like we have for Campaign.
Hope This helps!