An arm rappel is commonly used in caving and skiing for low angle
slopes like you describe. Main concern would be a secure anchor.

Large trees, boulders and snow bollards would take no extra gear
for an anchor. Rappel on the doubled rope then pull one end down.
No knots, no carabiner.

Military likes this since it takes so little time and leaves you
less exposed to fire. And if someone is shot they just fall away
from the rope and don't leave it clogged up for the next soldier.