score:4
I will point you to the Metro site for the Crenshaw/LAX project. At this writing, the Norwalk-bound Green Line will originate at Crenshaw from January 4β20, 2019.
The LAX G shuttle will drop off at the closed Aviation/LAX station as usual. There, go to Bay #8 and board Bus #853, a free temporary shuttle serving all the closed Green Line Stations, and ride it eastbound to Crenshaw. On the return, similarly, you would take the Green Line to Crenshaw, board the shuttle from the park-and-ride lot (west exit), and transfer to the LAX G shuttle at Aviation/LAX.
Nota bene: the FlyAway bus is less than $10 from LAX to downtown. Taking the G shuttle to the Green Line shuttle to the Green Line to the Blue Line adds at least three transfers and at least one change of mode, and to take advantage of the free transfer at WillowbrookβRosa Parks you need to buy a TAP card ($1 at a vending machine). Moreover, depending on the time of day, you might spend 20 or 30 minutes waiting for buses and trains to arrive, and the Green and Blue Lines don't exactly serve the most picturesque parts of L.A.
I personally wouldn't go through all that to save $7.25, but it's your time and money