Rotor Cranks (
www.rotorbike.com) has just released a new 2x9 crankset with their Q-Rings that fits your described needs. They say it works best with an MTB FD, and is available in a 40/27 configuration. More expensive than the Stronglight Oxale Two, but lightweight, adjustable chainline and with the added benefits of the Q-Rings.
This link takes you to the Spanish site, so switch to English (Upper Left) and then look in the Products area under the MTB components. It will be listed as 2x9 under the Cranks section.