Tbh this is advice. Kudos for being a scholar and informing people of the truth. Double points for encouraging someone to learn without spoon feeding.1) My build wouldn't help you. Like I said, its for p6p, not the basic-p6 in here.
2) 15 minutes of reading is all it takes to figure out how to build it yourself. The security risk of using something built by someone you don't know doesn't justify it.
3) couldn't tell you about fingerprint sensors, biometric security isn't protected by anti-self-incrimination laws, so I would never use and recommend that nobody ever use it. You should only use knowledge-based security.
Whilst I had a P6 is used Termux & Debloater Magisk module to unistall these and more. When in the Termux I noticed some system apps were in a new location in the system and I couldn't remove them. Used Commnad prompt to remove them.
I think that's counter intuitive. LOL You are right my friend why they don't buy something else.