I had to look up a hipper. I had never heard of one but they make sense for making a permanent bed. I really do not want permanent beds because it is so nice to till it all flat and clean and it allows to change bed widths year to year which helps in plant rotation. I like narrow beds for tomatoes, peppers, peas and such, with a little wider beds for onions, lettuce, potatoes, and then very wide beds for vines.
Also I like the height difference because it means a lot less bending for weeding and harvesting.
I do put heavy grass or straw mulch in the pathways to not have mud to walk in and it also rots and gets tilled in each year for soil tilth as it is heavy clay soil.
Since it is tilled before I do this I cannot use my compact tractor. My thoughts of mechanically doing this are a front mount tiller modified with something like your hipper idea or possibly a snow blower. I remember twenty-five years ago my brother on the farm wanted to put in a band of concrete along a fenceline feedbunk and he he had an 8' rear mount snowblower that he just set the height and went down the length of the bunk and created a 4" deep trough for the concrete. We then poured the concrete and leveled it and it has been there ever since.