No pretty solutions for this
Remake at 10-7 with sub in HUGELY favors JL and is just unfair to TU, because as much as being screwed over by the internet issues sucked for JL, they were also just lost second half.
Being allowed to fix it while being allowed to keep the advantage of Mouz being lost first half would just be bs.
Remaking from 0-0 would be very weird since it'd be a bo1 with Mouz currently traveling home and having no time to prac (no reason either since their season is over), so again... aint exactly fair for TU.
Giving them 2 rounds for the dc's (ignoring that it goes against the remake rules) and starting the game at 13-12 OT with the sub in would just be weird.
And a bo1 tiebreaker between JL and TU would be the best for us fans but wouldnt make ANY sense from a competitive standpoint.
Realistically Riot do just have to grow a pair and stick with their decision.
The harassment of teams and players that followed is not something that riot need to reward with special treatment... again. It wont help, people are going to be very upset regardless of the outcome anyways.
Use it as a learning opportunity and actually teach your admins how to properly deal with these kind of situations DURING the match.