The Fan on the Fan Shim will run continuously with no software installed, and will thus cool your Pi 4B. I think your still going to have issues even if you go that route though. The Fan shim fan control pin is GPIO 18 and that is used by the 2-Mic hat. Signals from or too the 2-Mic Hat on that pin will likely have the fan turn on off on off. Maybe even buzz etc.
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