A hedge would simply be buying one December euro position for every euro short position you own. If the euro continues to climb and the dollar drop, your gain in the December euro would offset most of the margin calls you are having on the September euro.
One hang up for many of you will be that you have an additional margin to fund. If you are near your limit now you might need to liquidate half your euro shorts to buy euros.
Let me know what you would have me do ASAP! We could activate the hedge if the euro moves to 1.19 or higher.