How can I "export" a model from Orange once I have prototyped a solution?
You can export any trained machine learning model in Orange using the Save Model widget.
This is what the Save Model widget does under the Model tab. Create your model, then click save model and your model will be saved to a pickle file. Then just load your pickle  file in Python.
Here is a like to a similar question on Stack Overflow:
https://stackoverflow.com/questions/45598627/orange-save-model-in-python-script