I am of the opinion that for certain Satanic souls, the awakening of the serpent may be fated. This could be from having awakened it in the past and it is now temporarily dormant until a certain point in the present lifetime where they will resume working on their soul and re-awaken it with ease.
For other people, to awaken the serpent usually involves removing a lot of dross from the soul(especially the jewish curses), among other practices like yoga. Remember that the birth chart and things like SR charts all show what is in the soul at the moment of birth. So to clean the soul may actually make the individual less and less affected by the planets so I don't think they can be used to predict such a thing for this individual.
Another thing to consider is that some people take much more time than others to awaken it, there have been cases of ordinary people who awakened it from severe injury on the tail bone, and so on. This is why I say it's all about what you do, your personal effort whether or not it is fated to happen (if that's actually a thing).