I think the statement of the problem is too general.
I think you will have to get more specific in order to converge on a solution.

Windows Communication Foundation (WCF) is a Microsoft technology. I doubt that it will be possible for a client on another machine that doesn't understand .NET to talk directly to this WCF service on the MS machine.

It sounds like what you will need is a service, that you build, that runs on the MS machine that provides translation between Greek and hieroglyphics. Your client program talks to this translator service which then talks to the WCF server.

Now, what this translation service does and how it works, I don't know. But it sounds like an translation layer between Microsoft and non-Microsoft is needed and that is a service that runs on the MS machine.