Okay - I didn't 'search' hard enough- I didn't realize the non-M "sport" front sway bar was of the same bend and the only difference was the endlinks and mounting points. So you can use a Sport front sway bar and, using the m3 endlinks, attach it to the strut mounts, giving it a higher roll resistance.
http://tarmacspecialist.com/suspension_faq/index.html Not necessarily good as it might be too stiff, but I guess I shall find out soon enough.