How to bring a .jpg into an open PSD file as a layer & smart object

Question

Note: Posted in MAC section also.
Goal:
Using a script - Bring a .jpg an artist chooses, into Photoshop in an existing project into its own layer, and make it a smart object.
This way, when the artist double-clicks on the smart object in Photoshop, it opens the original .jpg
Currently, doing this creates a new window and file - a temp file, called xxx.psb.
Photoshop does this by default to prevent destructive editing.  However, in this case, we purposely want to open the original.
Why?  the .jpg files are approved art by the organization.
Here is the script I did and have working in JavaScript.  (Has to be js because it will run on MAC's)
Currently, it creates a NEW file.  I want it, however to create the SO as a layer in the existing open file.
In JS: (has to be js for MAC's)
var idOpn = charIDToTypeID( "Opn " );
    var desc4 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
    desc4.putPath( idnull, new File( "C:\\Users\\jleahy\\Desktop\\JPG_Meeting.jpg" ) );
    var idsmartObject = stringIDToTypeID( "smartObject" );
    desc4.putBoolean( idsmartObject, true );
executeAction( idOpn, desc4, DialogModes.NO );

Answer 1

I'm half way there, but stuck at:
Getting a file location reference when the .jpg is first brought into PS as a layer.
Getting a script to write the location of the file into the medata for the PSD in some field
Reading back the metadata file location for the .jpg and bringing it back into the PSD again.
Any help would really be appreciated.
I can make the completed script(s) available when its complete, as this has possibilities for other uses, batch process, and more.