This is a good idea but I have a neighbor who lives downstairs who probably wouldn't like that idea.
Now I'm thinking that maybe all I need is to think up a reason for a sign to be staked in the dirt spot so he'd have to run it over or turn right. Not a "don't turn left" sign, but an ad of some sort. There's a pseudo-church up the alley, so I could put up a sign advertising an upcoming Holocaust survivor's speech at a different local church. That doesn't appear antagonistic, and people should go.
Pseudo-church?
sudo chmod -R 755 church
Good luck.............