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Little lat for an answer and I am not sure if I understood you correctly but I was able to respec NPCs' stats e.g. Durances' without problems (so they keep their new stats after reload). What I did, probably basing on similar tutorial, I extracted files from companion***.unity3d edited, imported back and replaced.

I am completely newbe to this (and game btw), but I desired to edit some thigs and found that reddit page. And I just wanted to tell you that this reddit procedure worked for me like a charm. For attributes anyway, because I did not notice any changes when I wanted to edit skills/skillbonuses. I have used 32bit version on Windows 10.