Hey Katja. First of all, I think all the unusual rhythms should be solved with your instrument aside. You just listen to the metronome and clap your hands or say something like “ta-ta-ta” with your voice. Preferably you should be able to do both. Do it at a slow speed. Try to feel the downbeats. Not to listen to the metronome beats, but to feel them.
Only after you feel it quite well, you can start playing it with your instrument.