Journey event triggered by identityMap namespace instead of picking one

Hi there,

We have an event that can have namespace1 or namespace2 in the identityMap, but not both at the same time. In an AJO journey, how can we start a journey with an event namespace that starts with whichever is available in the identityMap? I understand I can achieve this by building 2 different journeys and different namespace for each, but is there another way?

Thanks.