Does taking conventional medicine when sick remove one from qualifying to be from amongst the 70 000 who enter paradise with no previous accounting or punishment from the angle of the hadith that emphasizes Tawakul in Allaah?
No because the Hadeeth comes with the verb scale which is used when one asks for something
An example of this is if one seeking ruqya from others. However, if he does it on himself, then it doesn’t affect his tawakul.
The prophet صلى الله عليه و سلم would do ruqya on himself and the likes and he would get ruqya done on him such as when Jibreel did it on him without him asking
Also the prophet صلى الله عليه و سلم said
يَا عِبَادَ اللَّهِ تَدَاوَوْا ، فَإِنَّ اللَّهَ لَمْ يَضَعْ دَاءً إِلا وَضَعَ لَهُ شِفَاءً ، إِلا دَاءً وَاحِدًا ، قَالُوا : يَا رَسُولَ اللَّهِ ، وَمَا هُوَ ؟ قَالَ : الْهَرَمُ
Oh slaves of Allah take medicine for indeed Allah didn’t place a sickness except he placed for it a cure. [And do this for all sicknesses] except [for] one sickness. They said, “oh Messenger of Allah, and what is it?” He said, “old age”
Also the scholars differed regarding that narration: Is it specific to those three things mentioned only (i.e. not asking for Ruqya, not asking to be cauterized, and not having bad omens) or general?
Some of the scholars held it to be specific to these three and thus medicine doesn’t enter in to it
The discussion can be found in explanations of the narration.
Allah knows best
Majid Jawed Al-Afghaanee