No worries,
Yes, extracting only the above-mentioned .data files from the first pac file. Pac Editor is great to extract in the first time and inject in a second time.
It will take you longer, but when you save, you only save one line.
I suggest that you make a Save modd file on another hard drive for example, in which you make two sub-folders (Vanilla Save & Save modded). I always work like that in case of one of my files gets corrupted in game (CAE item, misc arenas files, or renders for belts modded for example).
You should know that when you edit multiline, WrestleMINUS is sometimes capricious, and crashes. Whereas if you only edit one line, this will never happen to you.
Yes, it is better to start with a clean file. But with this method, you should not have any more problems.
EDIT : If you want, I found the post that allows you to assign several possible entrances (evt) by "attires" for the same superstar :
https://smacktalks.org/forums/topic/71017-tutorial-assigning-different-entrance-motions-for-alternate-attires-in-wwe-2k19/