I have a similar problem, although not helmet related. The E90 standard headrests just seem to be too far forward. My wife, who is short, cannot get comfortable in the car due to the headrest position. The dealer offered to have the headrests modified by a local upholstery shop to remove some of the padding. I think this might be a good solution for the helmet issue as well. Have an upholstery shop remove the leather cover, resculpt the foam to the curvature of the helmet and replace the cover. This may require modification to the leather covering the headrest to make it look right.
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