When I used to fly two channel powered gliders (just after ice out when we still had to watch out for stepping in mamoth turds) I set the propeller to idle out in a horizontal attitude when the fuel ran out and landed with no wheels on her belly in pastures.

If the grass isn't short you're going to have a problem with landing. If you have to hand-launch to take off you're probably better off with a skid instead of wheels.