Good luck with a non-GA Web Beans release.
Anyways, Seam 3 is modularized. The Seam core team is trying to model their libraries more like Spring so you can pick-and-choose the functionality required at a more fine-grained level (e.g. only need AOP, or IOC, or MVC, etc).
I'm not sure how it will work in your scenario, however, since you are not using Seam 3 core.
Interesting question though. More than likely you will need to use Seam 3 instead of going the route you're talking about....