Chris: I haven't figured out what else breaks but I'm able to pip both the 64 bit SciPy and NumPy+MKL into the ArcGISx6410.2 python installation. So far I can import arcpy, numpy, and stats and signal from scipy without error. It's likely something in arcpy will break with this version of numpy... I'll report back what arcpy functions break or show different than expected results.
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