I think it would be way more fun to decide games with actual soccer playing than shootouts.
Maybe alternate 1.5 minute 6 on 5s in the offensive half. Kinda like college football. Play is dead if the defense clears it over midfield or the offense takes a shot that results in a goal kick. Keeps going back and forth until one team scores and the other doesn't.
Would be far more fun to watch and a more fitting display of soccer deciding the outcome versus penalty shots.
Had a flurry of chances to win it at the end...if they lose on kicks, it will be embarrassing. First give up 2 goals late to tie, including a last minute one. Then can't close it out with multiple chances at the end.