Surely, there is only ambivalence if one gives equal import to both the 'I want to drink' and the 'I don't want to drink' thoughts. Where one is beast thought and one is 'my' thought.
I do not think that AV makes one drink, rather it's how one reacts to AV.
If one clearly differentiates between the two thoughts, ie one is beast and one is mine, doesn't that remove any ambivalence?