Ok, finally I found the time to test mirakels latest obex version with my car and can confirm that PBAP works ;-)

Has anyone besides mirakels tested IrMC successfully?

@devs: Are you working on a newer version or do you think it is already possible to create a .deb file that can be added to extras?

For completeness: The special character issue I am facing seems to be indeed only affecting contacts NOT created on N900 but added by syncing from other devices.