I seem to recall that the method was to enable Universal poses, then re-save an existing character-specific pose in the library, which saves it as a Universal pose.

So load V3, pose her, then save the pose in the Pose folder, and it should turn into a Universal Pose.

Edit: That works, more or less, though more extreme positions will need some tweaking to match the original.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.