First thing I would do is make backup copies of your animation PZ3 files, just in case this does not work.

First question is are you finished with the animation movements? If you are happy with the results and don't plan to make more changes what I will describe will easy fairly easy to do. The first thing to do is turn OFF IK on your V4. Then turn it back ON. What this does is place Key Frames at all the joints that have IK movement (this would be things like knee bend). Now that you have those Key Frames go to Animation-->Resample Key Frames, Choice current figure and make a key frame every 1 frame. What this does is bakes in the IK movement without needing IK on. The problem is that it adds a Key at every frame and will make it hard to change your animation afterwards. Turn OFF IK and leave it off.

Now that your base figure is set apply your morphs.since these are new channels they should only have the one Key Frame and be easy to change along the time line.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13