An easy solution would be to add climbable guard rails to the 2 sides and a climbable aspect to the back. This would mean that no matter what direction the input and output are facing, the lift would still be climbable.
The only issue I see is that right now, three conveyors on a 3 wall port are a super tight fit which would cause clipping issues with added geometry. Perhaps just redo the existing model to replace the sides and back.