Compiling with resources from another jar

Considering the following:

I have a maven project A which I recently converted to Sass thanks to this plugin. I have another maven project B which has the core libraries of A as dependencies. In A, I define a set of "css constants" (colors, classes...) in a set of scss files. What is the (is there a) proper way to have an scss file import the reference scss files in module B so that it compiles properly?

unpacking the core jar:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <version>2.10</version>
    <executions>
        <execution>
            <id>unpack-commons-scss</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>unpack-dependencies</goal>
            </goals>
            <configuration>
<includeArtifactIds>artifactIdWhichIWantToUnpack</includeArtifactIds> <!-- I wonder if there is a better way to specify this, including the groupId to avoid any naming conflict -->
                <classifier>sources</classifier>
                <includes>**/_*.scss</includes> <!-- I only need the
"imported" files, not the root one, as I will use a different one in
the including module -->
        <outputDirectory>${project.build.directory}/sources-sass</outputDirectory><!-- A separate work  directory, to keep things clean and make investigating issues easier -->
            </configuration>
        </execution>
    </executions>
</plugin>

then, I need to copy the scss resources into the work directory (couldn't figure out a clean way to have the @import work properly otherwise):

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version>3.0.1</version>
    <executions>
        <execution>
            <id>copy-sass</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>copy-resources</goal>
            </goals>
            <configuration>
                <resources>
                    <resource>
                        <directory>src/main/resources</directory>
                        <includes>
                            <include>**/*.scss</include>
                        </includes>
                    </resource>
                </resources>
                <outputDirectory>${project.build.directory}/sources-sass</outputDirectory>
            </configuration>
        </execution>
    </executions>
</plugin>

finally, invoke the sass-maven-plugin:

<plugin>
    <groupId>nl.geodienstencentrum.maven</groupId>
    <artifactId>sass-maven-plugin</artifactId>
    <version>2.20</version>
    <configuration>
        <resources>
            <resource>
                <source>
                    <directory>${project.build.directory}/sources-sass</directory>
                    <includes>
                        <include>**/*.scss</include>
                    </includes>
                </source>
                <destination>${project.build.directory}/classes</destination>
            </resource>
        </resources>
    </configuration>
    <executions>
        <execution>
            <id>generate-css-using-sass</id>
            <goals>
                <goal>update-stylesheets</goal>
            </goals>
        </execution>
    </executions>
</plugin>

see: https://github.com/GeoDienstenCentrum/sass-maven-plugin/issues/120 and https://stackoverflow.com/questions/1007211/maven-add-dependency-on-artifact-source