My Idea on How To Stop AFK Players

Hello, I have just lost my final promotion game in a 5 game series due to an AFK Vayne in ADC. This has prompted me to write my ideas on how we can stop people from going AFK and people loosing LP or promotion games because one person doesn't want to play. In my opinion bans won't stop people from going AFK and stop unnecessary losses. These are my ideas:

1. People who leave a game should receive and LP deduction, for example: For the Next 5 Games you will win an extra 5lp and loose and extra 5lp. This will stop people from leaving in a way that not only effects one game, but also punishes them for a few games after their AFK.
2. The players on the AFK players team should be able to leave the game or surrender without a punishment. It is really frustrating to play with an AFK player and just as frustrating when you loose a Promotion, Get demoted, or loose LP because of a leaving player. So the players should be able to leave, or continue the game without loosing Lp if they loose.
3. For my final idea, I think that if you have an AFK on your team you should actually be able to see that they are a person likely to go AFK. Now with how the system works if they go AFK they loose LP and get in a Low Priority Queue, and after a few games it goes away and everything is back to normal. My idea is that if someone goes AFK they get a badge, similar to rank borders and commening someone, that shows that someone has went AFK
   Thanks for reading if you have gotten up to this point, these are just my ideas and if you have anything else to add, please feel free to add any comments and vote on the poll that I left for this topic.