I just tested it and it works as intended! It is a simple and elegant solution.
Glad it helped!
I would like to suggest maybe for future additions to Prodigy, for a functionality to be added to let you choose on which labels to train. For example something like:
prodigy train myModel --ner myDataset --config myConfig.cfg --base-model baseModel --labels A,B,C --label-stats
We can consider this! One difficulty we found in a general-purpose solution is that "label" can mean different things for each task, and that annotators may want different combinations. It's an interesting use-case for sure, you can check this thread for a similar discussion: Training on part of the custom annotations