As I see now, there was no support for MS SQL Server for Cloud Foundry v2 from Iron Foundry side. However now, since new service broker API is introduced, there appeared a possibility to implement one.
So, I could suggest looking at .Net Cloud Foundry v2 services introduced by Altoros team. There is a general .Net service broker component, which translates REST API of service broker into c# interface and is possible to host both in IIS app and Windows service. Also there is an implementation of this interface for MS SQL Server, so it is now available for CFv2.