For those of you interested, I can confirm that Compadre works very well with Live 4.1.2 and it's possible to setup true stereo sidechaining fairly easy.
I've put together a video tutorial showing the basics of hooking up stereo sidechaining in Live using Compadre (and other plugins using a similar approach): Download here (7,48 MB)
Remember, I have no prior experience with Live before testing this out so there might be shortcuts and way to speed up the method that I'm not aware of.
Anyways, hope it helps.
Best regards,
Rune

