Require a LU /GUP to provide updates only

We have a SEPM in Network A and 20 unmanaged machines at a seperate branch - Network B . Can I setup a liveupdate server in Network B to provide updates only and not manage these machines(policies etc) and use Network's A SEPM to obtain updates-? Customer only wants to use one server to provide updates to all 20 machines....

Any help would be appreciated.

Thanks in advance