PHPでES6っぽくdestructuring of arrays

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PHP7.1で追加された destructuring of arrays は、下記のようだが

$user = ['name' => 'Nancy'];

['name' => $userName] = $user;

echo $userName // => Nancy

下記のようにネストできることに気づいた

$user = [

"address" => [
"country" => "jp",
"prefecture" => "Hokkaido",
],
];

['address' => ['country' => $country, 'prefecture' => $prefecture]] = $user;

echo $country; // => "jp"
echo $prefecture; // => "Hokkaido"

ES6みたいに、キー名がそのまま変数名になったら良いのに・・・できる方法は無いのだろか。