Switch Bindings will do a two-way mirror sync and works for Fan Controllers, in fact I am doing the exact same thing as you for when I was messing around with the User vs System Bond apps.
https://github.com/joelwetzel/Hubitat-Switch-Bindings
There is also this Mirror Plus app which IMO I like the UI Better but I think it only does a one-way sync similar to the built in Mirror app.
Fork of Phuc Tran's Device Mirror App that adds a couple additional devices and extra mirroring capabilities for devices that already existed.
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