Autofill Solution
Show your teammate's role preference in the champion select screen.
That way when multiple people are autofilled into each other's position it's a simple matter of switching roles.
In this current state, 2 outcomes exist. I tell people I got autofilled marksman and I'm a top main
A) "happens to us all, good luck" B) "I'm a marksman main and got autofilled top, let's switch"
Showing primary and secondary roles of teammates will make it easier to coordinate.
At the rate, I rather go back to pick order.