External Contact Search with or condition

Hello,

I am trying to update External Contacts with new information (phones). Since there is nothing similar to uploads in contact lists (that checks the unique identifier to avoid duplicates), I have to look for the external contact and update it.
I am told that this update requests will have around 2000 contacts.
So far I can search for a contact using a identifier in custom fields and update it, but I would like to use bulk operations.
The question: I have checked that q parameter makes an "and" with all the words in it. Is it possible to make an "or" with these words in q parameter?
Is there any other way to get several external contacts?

Thank you.

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