How to classify users by department from ume directory

Hello

I have a current need to create a taxonomy based on the ume:department property of the /ume repository, to have a list of users by department (ume is connected to our LDAP)

In order to achieve this, I have to created a taxonomy, but to have this Query-based taxonomy work, I have to enable the properties-service, which cannot be done on the ume-repository - or can it ?

I would like to avoid coping, via ICE, the /ume repository to an otherone that index for classification.

Is there a way to overcome this problem with duplicates of the UME-content and still being able to use a taxonomy?

Any help will be rewarded.

Regards,

Vincent