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I wondered if anyone had written an IWM simulator, and I didn't find one, but I did find this FPGA project:

Someone's trying to reverse-engineer the IWM, but they have not yet quite succeeded: https://www.applefritter.com/content/iwm-reverse-engineering

Somewhat related, there's a MiSTer implementation of the Apple II: https://github.com/MiSTer-devel/Apple-II_MiSTer