5v5v5 doesnt seem workable... but 1v1v1
1v1v1 or 2v2v2 (duo) could be very interesting. Dealing with the aspect of not looking attractive to fight on top of everything else could be a unique experience. Some examples:
"Ok the Riven is committing really hard to killing me i need to control the situation so that Zyra will backstab her and then i can kill Zyra"
"I need to play defensively until the other 2 start fighting and then i can melt them with aoe"
Etc etc