Wrap boilerplate wcf client code

I have to add header to wcf service call.

I've implemented it this way:

var client = new ServiceReference1.HeaderConsumeClient("NetTcpBinding_IHeaderConsume");
using (OperationContextScope scope = new OperationContextScope(client.InnerChannel))
{
    Guid apiKey = Guid.NewGuid();
    MessageHeader<Guid> mhg = new MessageHeader<Guid>(apiKey);
    MessageHeader untyped = mhg.GetUntypedHeader("apiKey", "ns");
    OperationContext.Current.OutgoingMessageHeaders.Add(untyped);

    var res = client.GetData(1);
    Console.WriteLine(res);
}

But i'd like to make general solution without such boilerplate code at every service call.

The most common way, i think - is to make my own TT4 template and wrap every call in generated proxies.

But before it will be done i want to know, is there a some other ways to override or decorate wcf generated classes methods?

For example - i can use unity and register implementation of this service interface and add interceptor to all calls to this instance. But it looks a bit overcomplicated.