I usually ask for a scene file. So the questions will not go on and on to share more details with each post. Every new unveiled detail will often render anything said before useless. It is impossible to go from a general question in all possible information.
(I’m happy to give you an upload link if it has to stay private [not preferred, as no one else can learn from it] or I download from Dropbox, Amazon, Apple, Adobe, Wetransfer, or Google. I do not use other cloud service nor shortened URL for security reasons.)
The Eye-blinking is undoubtedly not done with a single PLA, given the idea that it is rotational motion. So, you need the full sequence of the animation. So from one storage of the points, you multiply the amount of data a lot. This must be done for a good reason then.
Animation Clip can do PLA animations, but as mentioned, you need to have the same hierarchy always in the clip already. The Position of the Animation Clip Tag specifies the hierarchy-position. Anything below that needs to match. So before you start, this must be a standard. It ends up in a huge mess otherwise. Do you want to move the whole animation into Animation clips?
In other words: What animation will overwrite others? Given the low information I have, I’m not clear about the whole set up. I do not see an advantage right now. I saw it with single static poses, blending, but honestly, also here, the Posemorph is much faster. What do I miss?
So, do you need an upload link?
All the best