I'de suggest introducing a picker/selector node that take a number of sets of control flow and data inputs, and outputs one control flow and one data node - the data being outputted would be the data that matches the active control flow input. See the example below:
An alternative layout of the node would be to pair up the Alpha In and Alpha Data, and the Beta In and Beta Data.
Having a numeric input to select the number of input nodes would just be an added bonus. That way the node could be 2x2 inputs or 6x2 inputs or any other number of pairs.
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