A good option is to implement Ordered interface only for the following classes:

    ro.isdc.wro.util.provider.DefaultConfigurableProvider 
    ro.isdc.wro.extensions.support.spi.DefaultConfigurableProvider 

The reason is the following: there are many default providers and all of them have to be changed. The above classes are responsible for gather all of the providers, so it is more convenient to use only two of them (one for wro4j-core module and the second for wro4j-extensions module).