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I should probably get one of the actual typescript experts at pulumi to look over it and suggest improvements

I have copied your code, slightly simplified it for my needs and then I was able to get rid of all async-awaits and thus the factory method. So it is doable.

Do you still have it dynamically calculating the subnet ranges based on the number of AZs?

I got rid of perAz though, which was resolving the number in promise

This should be solvable too with carefull promise passing