The wicked Balaam. The donkey of Pinchas ben Yair. The concept of soul.

Hello Rabbi Michi.
This is a question not about faith or law, but simply about legend. Because it was mentioned here once in one of the posts that you studied Kabbalistic thought a little. This is a theoretical question. That is, a question about your knowledge of the issue and not your opinion (which I assume, like the other topics related to these issues, you leave in "needs research").
When I read a little of the commentary of the Holy Light of Life and its Mishnah, in the chapter of his commentary on Parashat Balak, if I am not mistaken about the verse "My soul shall die, the death of the righteous" of the wicked Balaam, he writes that there is no shell in the world (and I assume that shell in the language of the Kabbalists means a negative, evil force). That there is no holy spark in it. My soul. That will revive it. And that in fact Balaam was prophesied that his holy spark would undergo reincarnations and be corrected. And there would be a responsibility like him. Like the holy soul of the Israeli who killed him. And when it was reincarnated into the donkey of Pinchas ben Yair. Balaam's spark. Returned to its purity. Also in one of the reference books of Rabbi Yitzhak Ginsburg, it is written that "the light" demands that the verse be rejected by the wicked Balaam and the likes of wickedness of his kind. That is, he claims that even the worst wicked, wicked people have a good core. Which could be corrected at the end. Which reminded me a bit of the expression Reshimo of holiness. Which I first encountered with Rabbi Tzadok HaCohen. Who claimed that the greatest wicked man in Israel. Perhaps he. From his own perspective, has no part in the world to come. – But the impression of holiness in it. From the perspective of Israel, it is in it. – From this perspective, he has a part in the world to come.
The same legend about the reincarnation of the soul in Pinchas Yair's donkey. I also heard about one of the Kabbalists who commented that in the bad part of his life, he reincarnated into that donkey and was corrected.
 
I am not here to be a clown or waste time, and in short, I asked:
In general, according to your knowledge of the writings of the Kabbalists, does the concept of a "divine spark" frequently exist among them? Or a holy spark that exists in every person? And is that spark, according to their system, separated from the personality of the evil person himself? (Perhaps a bit like the theoretical intellect in Aristotle, which is eternal, separated from the person himself? It reminded me of that very much.)

• Is there a parallel between the concepts of "a spark in the shell" and the concept of "the virtue of Israel"?

And on another level, what is the opinion of the Kabbalists, most of them, according to your knowledge, on the whole issue of free choice? From a brief review of their writings, I often find a somewhat dramatic view.
If you had lectures on those topics, I would be happy to receive a link.
Thank you and good evening.