q-eud-export-field.php

// Add the filter ##
\add_filter( 'q/eud/export/field', [ get_class(), 'field_key' ], 10, 1 );

/**
* Filter keys in EUD plugin
*
* @since 2.0.0
*/
public static function field_key( $string = null ) 
{

    #error_log( 'string from EUD filter: '.$string );

    if ( is_null( $string ) ) {

        return false;

    }

    // rename specific fields ##
    switch( $string ) {

        // usermeta field key ##
        case 'example_usermeta_key' : 

          // string replacement to show in export ##
          $string = 'Cleaner Title' ; 

        break ;

    }

    // apply optional format to all strings ##
    $string = str_replace( "_", " ", ucwords( $string ) );

    // kick it back ##
    return $string;

}