After examining every little part of the bumper from every possible angle apart from damaging it there is no way to remove the grill without first taking the bumper off, once thats off though its appears very easy.
But, I have found a flap that allows relatively easy access. Under the bumper about 3" from the front are 4 torx screws and another 2 smaller ones just in front of the ends, remove all 6 and the flap folds down and you can easily get your arm in there.
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