If you are putting a rope on the backleg you are doing about the same as a calf fork, only you have a table with a head ketch or something to hold the front end and a calf fork is attched to a pin in the ground and the head of the calf.
Of course you don't have to have a horse to ketch the calves with your system, but with Soapweeds invention or something of it's type, you don't have to push calves down a chute and can even leave the cows with the calves if you want too, unless some are maybe too good of mothers!
Whatever works and you like, is probably the best way.
I do have a neighbor who went back to roping and dragging calves after he got a knife stuck in his hand, while casterating on a calf table. But I suppose that could happen with any way you branded calves. I've sure cut my thumb and finger quite a few times whiule casterating! But I'm kind of a klutz! And the skin always has grown back.