It's quite possible... but before anyone jumps in to make it 😉 ... have you tried PushPull?
Group your contours and add a large flat face for them to intersect with - adjusting their extents etc as needed.
Now you can PushPull the face between the contours to the required level.
Other matching contours can be 'matched' within PushPull by picking a point on a previously made one.
If you know that your contours are at 5' intervals then PushPull one 5' and subsequently a PushPull with a double-click on a face will lift/drop that face by the last used amount, double-click again and the amount doubles, again and it trebles and so on...
When done erase the side edges to remove the faces between contours...
Sometimes a native technique can be as quick as using a custom tool... 😕