ZeroMQ: Recommended pattern for inproc clients from multiple threads pushing ordered messages to a server?

My requirements

• Clients from different threads in the same process
• Server in a separate thread in the same process
• Clients produces messages to Server
• Server consumes messages by printing them out in the send-order by world clock on the source side, transparent to threading and any scheduling.

Answers to questions like

• zmq: can multiple threads PUSH in a simple PUSH-PULL pattern
• Pulling requests from multiple clients with ZMQ

give different opinions. So should I simply ask clients to PUSH to a single inproc PULL server created in another thread or use a router-dealer pattern?

And in one of the comments of the second question, I get STREAMER pattern that seems to exist in pyzmq, but I'm not sure if it's the right solution or is it available with C API at all?