Different AJAX queries for DataTable and Editor

I have some complicated data that I'd like to show in addition to the data that's available to edit.

In this specific case, I'd like to show a table that acts as a scoreboard where the game data is editable, but I'd like to also include the region of each team, which requires a left join on two fields: the season and the team name (or the season and opponent_name). Eventually I'd like to include some calculated values (such as each team's current W-L-T record, ranking in the polls, etc.). In short, I'm looking to include data that the joins in Editor can't currently accommodate, so I'm using an SQL statement to retrieve the data.

Here's the PHP page for the DataTables ajax:

<?php

// DataTables PHP library
include "../../Datatables/Editor/php/DataTables.php";

use
 DataTables\Database,
 DataTables\Database\Query,
 DataTables\Database\Result;

// Query
$sql = "

    SELECT g.*, tra.region AS team_region, ora.region AS opponent_region,

       /* Add DataTables identifier */
      CONCAT('row_', g.id) AS DT_RowId,
       /* Add back in the fields used for joins */
       g.season_name AS season_name, g.team_name AS team_name, g.opponent_name AS opponent_name
    
    FROM
    
        sa_game g
    
    LEFT JOIN
        sa_region_affiliations tra
        on tra.season_name = g.season_name AND tra.team_name = g.team_name
    
    LEFT JOIN
        sa_region_affiliations ora
        on ora.season_name = g.season_name AND ora.team_name = g.opponent_name
    
    WHERE g.season_name=". $db->quote( $_GET['season'] ) ."

";
$records = $db->sql( $sql )->fetchAll();

$data['data'] = array_merge( $records );

echo json_encode( $data );

Notice in the SQL I'm returning the DataTables row identifier:

      /* Add Datables identifier */
      CONCAT('row_', g.id) AS DT_RowId,

And I've noticed that any fields that are used in a join are not returned, so I've added them back in this way:

      /* Add back in the fields used for joins */
      g.season_name AS season_name, g.team_name AS team_name, g.opponent_name AS opponent_name

Now the DataTable is good (or at least from the perspective that everything shows as I would hope), and I can edit an existing or create a new row, but Editor uses a different ajax call to submit the data.

Here's an abbreviated version of the PHP page for the submit:

<?php

// DataTables PHP library
include "../../Datatables/Editor/php/DataTables.php";

// Alias Editor classes so they are easy to use
use
    DataTables\Editor,
    DataTables\Editor\Field,
    DataTables\Editor\Format,
    DataTables\Editor\Mjoin,
    DataTables\Editor\Options,
    DataTables\Editor\Upload,
    DataTables\Editor\Validate;

// Build our Editor instance and process the data
Editor::inst( $db, 'sa_game' )
    ->fields(
        Field::inst( 'season_name' ),
        Field::inst( 'team_name' ),
        Field::inst( 'opponent_name' ),
        Field::inst( 'scored' ),
        Field::inst( 'allowed' )
    )
    ->where( 'season_name', $_POST['season'] )

    ->process( $_POST )
    ->json();

Of course when I submit I don't have the team_region or opponent_region anymore, so I get the following error:

DataTables warning: table id=scoreboard - Requested unknown parameter 'team_region' for row XXX, column Y.
For more information about this error, please see http://datatables.net/tn/4

I've read this post:
https://datatables.net/forums/discussion/39437

There it states to use initEdit() and val() to set the additional values, so I've added the following into my editor, creatively named "scoreboard_editor":

.on( 'initEdit', function ( e, node, data, items, type ) {
    scoreboard_editor.set( {
        'team_region': data.team_region,
        'opponent_region': data.opponent_region
    } )
} )

If I do console.log(data.team_region) I see the correct region, but when I hit submit I get the same error as before.

So a few questions on this approach in general:
1) Is they way I'm retrieving the data the best way? Do I have to actually create the DataTables row identifier and add back in the fields used for the joins?
2) What is correct way to "forward" the additional data through initEdit() and val()?
3) Is there a way to requery the DataTable such that if the team or the opponent were to be changed then their proper regions would be retrieved?