Combining RAD Build Utitlity with Jazz Build Engine

We are using Jazz Build Engine and we want to combine this with the RAD Build Utility. Our target is to create a build environment where we can use RAD Build Utiltity in combination with the Jazz Build Engine Ant Tasks. We want to use one build file where we can use RAD Build Utility and Jazz Build Engine Tasks.

We tried to create a new Eclipse Plugin including the Jazz Build Engine Ant Tasks so we can register this plugin in the RAD Build Utility. But this does not work because of different dependencies having RAD Build Engine and the Jazz Build Engine. (I get a NullPointerException deep inside an ant class when I want to call a jazz ant task inside this new plugin).

The only way to solve this problem is to start the RAD Build Utility from inside a Jazz ant build file by calling the exec task of ant and invoking the runAnt.sh.

Is there an other way to achieve this?