We utilize SQL Server Availability groups to distribute much of our master data across multiple servers. We then create synonyms to reference specific tables within other databases on the instance with the same performance as they exist within the same database. SQL Server has supported synonyms since it's 2005 version.
I have not been able to find any workarounds for this issue.
The lack of this feature leaves us only being able to access portions of our SQL Data for a given application and removes much of the benefit of using Composite in our organization.