Is it permissible for one who is unable to gesture with his head to gesture with his finger?

Question : Well, some of the common people say that if one is unable to gesture with his head, or rather with his finger, they raise the finger while standing, and when bowing, they bow the finger like this, and when prostrating, they prostrate it by bringing it together.

Answer : Yes, this is an analogy. They say that since he is unable to use his whole body, he is required to use a part, and the finger is a part of the human being. Yes, so if his whole body is unable, let the praying person be the finger. Well, the index finger is more appropriate because it is the one used to point to the remembrance of Allah and to supplication to Allah. So if he gestures with the middle finger, according to the analogy of their position, the prayer is not valid, because the index finger is the one obligated to pray. What is your opinion of this analogy? This is an analogy with no basis. The Sunnah did not bring it, and the scholars did not say it. But, glory be to Allah, even though none of the scholars said it, as far as we know, it is well-known among the common people. They say, "So-and-so, by Allah, is very, very sick and prays with his finger," which is an expression of his inability. But we say that since the Sunnah did not come with this, and no scholar preceded in saying it, it is obligatory for students of knowledge to clarify to the common people that this has no basis. I mean, the eye is a matter of disagreement among the scholars, and it has been established for us that the correct view is that one does not pray with it. So what about the finger, for which the Sunnah did not come, neither a weak nor an authentic hadith, and no scholar said it?