Map non-matching AD fields for site locations

I use the AD sync tool in my org to sync user details to my service desk plus on demand...

I have multiple tenants in my suite that I separate into multiple sites... So something like "DC Company1" "DC Company2, etc. etc...."

Company 1 is my organization, and Company 2,3,4 are other companies that we support in the same geographical region... (some sit in our offices, some across the street, etc..)

Everyone but Company 1 is not in our AD in any way...

Everyone in Company 1 is synced from AD to ServiceDesk, but in the field 'physicalDeliveryOffice' which is mapped to the "Site" field is simply "DC"

Is there a way for me to make it so that "DC" in the 'physicalDeliveryOffice' maps to "DC Company1" in the helpdesk? (like a SELECT AS or something to that effect)

I do NOT want to change it to "DC Company1" as it would affect a zillion other things and look weird as it propagates out to other applications...

I also don't want a site to be simply named "DC" in my helpdesk, as that can be confusing.

I don't want to reorganize our helpdesk to use different regions and I have considered making Company 2,3,4 different "departments", but that does not really align with how I want it to be set up...

I am aware that I could use another random AD Attribute but I would also like to avoid that.

Thanks!!!