That is only one way of doing it and they are rare.
There are plenty of other ways of getting the correct angle and lift and if you google it you will see lots of alternatives
Last time I put one in with remote diff casing was about 1972 and I managed it by not fitting the radiator and being a lot stronger than I am now. Used to remove the radiator shroud back then so allowed a lot more wriggle room. This time it is with full radiator fitted and shroud intact. The one idea I had forgotten was to raise the rear of the car to help with angle of entry.
I don't need this cradle for now as the engine is in but if I have to take it out again it would make life easier for me as I'm on my own.
Some one has offered me one now and am waiting for a piccie before commiting.