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The diff's oil fill plug should not be torque that tight. On my car it had very low torque. Less than say the oil filter housing which is 19 Nm I think.
IF your diff's fill plug is over torqued... first I would buy a replacement plug from BMW, since there is a seal on it that might be damaged. And then I would use the biggest longest breaker bar - that wil fit under the car. Raise the rear end WAY UP in the air... use some jack stands... then have a go at it with your breaker bar. The longer the better. You can even use a pipe over your ratchet or breaker bar - to get more leverage on the plug.
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