Got my friend's account permanently banned

To jump right in, my friend let me play on his account and I managed to get him a 2 week suspension and then afterwards, despite my efforts, a permanent ban. My behavior did not improve enough in this time frame and I was still being toxic albeit to a lesser degree, as a result I was permanently banned. My friend is one of the nicest people I know, and I understand account sharing is against the rules however I don't feel that it's fair that he will never be allowed to play on that account again for the one mistake of allowing me to play on his account, after all he was simply trying to help out a friend, albeit a shitty one. Many professionals have also shared accounts back and forth and I feel it's not seen as such a big deal unless you are providing or receiving a boosting service. All I want is for my friend to be able to play his account again, as if I had never touched it. I am willing to accept a permanent ban on all 3 of my personal accounts which I have spent in excess of £1000 on. I am an extremely toxic player, I admit it 100%, I literally cannot control it, if I was sent to a North Korean reform camp I would still come out and still be just as toxic as before. Nothing can change me, I am among the top 0.006% of players toxic enough to receive a permanent ban and I understand that. I just want Riot to banish myself from league of legends forever because I clearly don't belong here, and to allow my friend a second chance.