Currently, the BM id and BDA ID are practically equivalent.
Retrieving the BeanManager if said ID is known requires iterating Deployment.getBeanDeploymentArchives() until the BDA is found and then retrieving the BeanManager from the deployment by using Bootstrap.getManager(BeanDeploymentArchive beanDeploymentArchive).
This can be simplified by introducing Deployment.getBeanDeploymentArchive(String BDAid). Another possibility is to provide Bootstrap.getManager(String bdaID). Both variants would simplify the access code and make it work faster.