Tried using ejb3-interceptors-aop.xml, however it seems you cannot modify @Clustered annotations, since the EJBs already have @Clustered on them.

This file is where the defaults are currently, This file can be modified to allow you to specify the default loadBalancePolicy to be specified and the default sticky load balance policy in the $JBOSS_HOME/server/$PROFILE/deployers/ejb3.deployer/META-INF/ejb3-deployers-jboss-beans.xml
jboss-ejb3-proxy-clustered-1.0.3/src/main/java/org/jboss/ejb3/proxy/clustered/registry/ProxyClusteringRegistry.java