You don’t have to go that far from the airport to park on a street and take a public bus into the airport! I know as I live within about 5 miles as the Crow flies. I was so looking forward to helping my daughter record our unique travel day. It would have been the first I’ve seen to take a public bus from our house to the airport!
You can park far closer than my house to the airport to be clear. Either Cranford (not the best area) or Bedfont.