Although..!!
That’s perhaps overthinking it? Or is it perhaps underthinking it? 
A Trigger macro by name type of action (or mode of the existing action) that couldn’t do anything other than trigger a macro by name* would be comparable to the insert action by name feature in the KM Editor—perfect for the job!
Anyone who needed to add more filtering (is there any evidence that such a user exists?) could still use the current action (or current mode of the action).
Well… I don’t mean to start another debate. That’s just my view of what is and isn’t needed, should the matter ever be reconsidered.
* Retaining the scope feature of the action; that’s very useful!