In an cdi extension the bean manager is injected so camel cdi shouldn't use deltaspike for it.
A nice side effect of it will be it will remove WARNING
The only trick it will need will be to give org.apache.camel.cdi.CdiBeanRegistry the bean manager to use. A thread local or delegate (registry.getDelegate()) falling back to DS if null should be fine. It just needs to be resetted after extension startup.