Can our local team still use Visual SourceSafe (VSS) and our remote team use SourceAnywhere for VSS on the same database?

Yes. The co-existence of Visual SourceSafe and SourceAnywhere for VSS is OK. SourceAnywhere for VSS Server behaves like another Visual SourceSafe Client when it accesses the Visual SourceSafe database, so running SourceAnywhere for VSS does not affect other Visual SourceSafe users.

Actually, this is the common scenario how our customers use SourceAnywhere for VSS.