When attending a NO mass would kneeling for the final blessing be considered disobedient or just odd or traditionalist?
Check what’s standard in your country, I guess. I’ve seen kneeling as the standard posture for the final blessing in at least one parish in mine, so I guess it goes by local custom to some degree.
I’ve never seen kneeling for the final blessing in any NO mass I’ve attended, but if you want to that wouldn’t be a problem.
I have seen people kneel for the final blessing in some traditional novus ordo parishes. I myself have done this. However, I don’t this is proper within the context of the Pauline Mass and so I don’t do it regularly. I do occasionally kneel if the blessing is given outside of Mass.