why don't you just exclude it?
<dependency>
<groupId>my.naughty.thirdparty</groupId>
<artifactId>thirdparty-with-log4j-over-slf4j</artifactId>
<version>${thirdparty.version}</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
</exclusion>
</exclusions>
</dependency>