Page qualifiers on the "Children Display" macro

To organize all the pages that are children of a given parent, I want to be able to create "sub-trees" of the child pages.

To do this, I would want something like a "Children Page Name Qualifier" on the "Child Display" Macro. 

An an example, I have a parent page: "Cars for sale" and a bunch of child pages describing individual cars for sale, one car per page.  Only some are Ford, Toyota, Subaru, etc.

Using a "Children Page Name Qualifier" I could group child pages together based on a name qualifier.  So, for instance:

Parent Page = "Cars for Sale"
Ford 1990 Bronco
Ford  2004 F150 Truck
Toyota 2009 Land Cruiser
Toyota 2016 Camry
Subaru 2012 Outback
Subaru 2021 Impreza

Now I want to split up the children into "type" sub-trees:

{ expand
     {  Children Display
          Parent Page = "Cars for Sale"
         Children Page Name Qualifier = "Ford*"
{ expand
     {  Children Display
          Parent Page = "Cars for Sale"
         Children Page Name Qualifier = "Toyota*"

{ expand
     {  Children Display
          Parent Page = "Cars for Sale"
         Children Page Name Qualifier = "Subaru*"