Just for information I found a solution using velocity templates instead, utilising URLResourceLoader to supply vm templates over Http.
Code:
<bean id="velocityConfig" class="org.springframework.web.servlet.view.velocity.VelocityConfigurer">
<property name="velocityProperties">
<props>
<prop key="resource.loader">file, MYO</prop>
<prop key="MYO.resource.loader.class">org.apache.velocity.runtime.resource.loader.URLResourceLoader</prop>
<prop key="MYO.resource.loader.root">http://static.content.com/static/</prop>
<prop key="MYO.resource.loader.cache">false</prop>
<prop key="MYO.resource.loader.modificationCheckInterval">0</prop>
</props>
</property>
</bean>