You could look at the Inglewood parking shuttles. You pay both for parking and for each individual taking a shuttle. But there appears to be capacity available even for events that have a very short lead time. https://inglewoodparkgo.com/
A less expensive option seems to be the Gardena 7x Bus line. It runs for games and picks up from the Harbor Gateway transit Center ($3 parking on game days). I couldn't find anything recent, but a 2018 Reddit thread said that the facility did not fill up on game days.