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I'll try to rework the BOM and create a dynamic version.

As of now, only Duet3D has been fully tested (which is what I have). As I've mentioned in one of the updates, I've implemented the Prusa MMU2 protocol, which is supported by the SKR 1.3 running on Marlin 2.0 (as far as I can tell from reading the source code) but this has not been tested yet (afaik).
If you wanna give it a try, I will assist you as good as I can.