Can I restrict Maven to use a given Nexus repository (group) only to resolve plugins and their dependencies (and *not* for dependencies of the project itself)?

At the moment, I use a `settings.xml` which mirrors everything in a "public" group:

```
<?xml version="1.0" encoding="UTF-8"?>

<settings>
    <mirrors>
        <mirror>
            <!--This sends everything to /public -->
            <id>nexus</id>
            <mirrorOf>*</mirrorOf>
            <url>http://ik-repo:8080/nexus/content/groups/public</url>
        </mirror>
    </mirrors>
    <profiles>
        <profile>           
            <id>nexus</id>
            <repositories>
                <repository>
                    <id>central</id>
                    <url>http://central</url>
                    <snapshots><enabled>true</enabled></snapshots>
                    <releases><enabled>true</enabled></releases>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>central</id>
                    <url>http://central</url>
                    <snapshots><enabled>true</enabled></snapshots>
                    <releases><enabled>true</enabled></releases>
                </pluginRepository>
            </pluginRepositories>
        </profile>
    </profiles>
    <activeProfiles>
        <!--make the profile active all the time -->
        <activeProfile>nexus</activeProfile>
    </activeProfiles>
</settings>

```

Now I would like to use a second group "pluginPublic" (in addition to "public") that is used to resolve the dependencies of the plugins. 

The background is as follows: I want to allow certain dependencies to be used by Maven plugins but not allow every developer to access them for their build.