Array formatting from XML web service using Set::combine

I'm having a bit of trouble with Set::combine when using it to deal with xml converted into an array.

I am using the XML utility library, then Set::reverse() to flip it from an object into an array for easy traversal

The problem is that if a child element only contains 1 record, it is formatted as such:

array(
    'Result' => array(
        'userID' => 5,
        'name' => 'bill'
    )
);

but if the the same child element contains multiple records, it is formatted as such:

array(
    'Result' => array(
        1 => array(
            'userID' => 5,
            'name' => 'bill'
        ),
        2 => array(
            'userID' => 25,
            'name' => 'jane'
        )
    )
);


how do I reliably reformat this array using Set::combine() to provide me with an array whos keys are userID and whos values are name?

I've tried using Path1 as 'Result.{n}.userID' and Path2 as 'Result.{n}.name', however this will not work in the first instance as it is doesn't contain the {n} path....

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