The wildfly-maven-plugin supports channel manifests in its configuration. Using a channel manifest allows simply the versions to be overridden which is what the goal of the feature pack is. Using a manifest allow testing with overridden RESTEasy libraries. It would consumers to use an overridden version of RESTEasy when provisioning a WildFly server as well.

<channels>
    <channel>
        <manifest>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-manifest</artifactId>
            <version>${version.org.jboss.resteasy}</version>
        </manifest>
    </channel>
</channels>