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F.Y.I...
I've added a Prusa MMU2 emulation mode to the latest version of the firmware (1.2).
Hence, you should be able to drive the SMuFF without modifying the marlin firmware by just pretending it's a Prusa MMU2.
Not sure if this works, since I don't have an SKR controller to test.
Let me know if you still plan to build one.