Custom Gravity ground/surface checking (help)

I am working on creating a gravity system where it can be changed at a moment's notice. I made a script that successfully changed the gravity direction on an individual object and which even rotated the character to land on its feet.
However, my biggest thing is trying to find a way where the player will fall with gravity, hit the surface, and then try to stand up.
I need a way to check for the ground in accordance with freeform gravity. I normally use raycast to check the ground but I don't see that being a good way if the player is on his back.

Sorry if this in the wrong discussion

 

Why? You wouldn't raycast towards the feet, you would raycast towards gravity direction.

 

Or just maybe check the rotation on the player's object to see if it's upright / what ever else?

 

From player's center of mass, you can raycast, toward gravity source, or player's velocity direction and check for surface hit.

Just thoughts.