Using the havok conversion tool provided with the CK, I was able to convert all of my old Skyrim female walks and idles to Skyrim SE.  Also able to convert skeleton_female.hkx, though I don't think it's having any real effect there.   The tool is in Your Skyrim Special Edition directory under Tools, HavokBehaviorPostProcess.   I wrote a batch file for converting Skyrim 32 hkx files to 64 bit.  It's very simple, DOS batch files aren't my forte.   - Unzip "convert_HKX.zip" to the same folder