no need to change the interceptor. The interceptor is the one that detects that there was no strategy set. The strategy is set via a portal property, like:

<deployments>
 <deployment>
 <parent-ref/>
 <if-exists>keep</if-exists>
 <portal>
 <portal-name>default</portal-name>
 <properties>
 <property>
 <name>layout.strategyId</name>
 <value>maximizedRegion</value>
 </property>
 ....