LabVIEW Python node - share non-serializable object

[Łukasz]

I'm using LabVIEW python nodes to call a python script, which creates an instance of OPC Server class. 

def initServer(url):
    server = Server()
    server.set_endpoint(url) 
    ...

The Server object cannot be serialized to JSON as well as cannot be pickled (TypeError: cannot pickle '_thread.RLock' object), so I can hardly see the way how to transfer Server object to LabVIEW.

In that case I managed to store Server as a global variable in python script. This solutions works - I can call functions (ex. start/stop running) that simply use a global Server object.

However, this solution is not secure - because if I lost the python session (due to the LabVIEW issue), I have no access to my Server. That leads to the question:

Is there any more secure way to handle that?