I did it in the end.
I sat the TV on the floor, found some foam corner supports from my subwoofers, sat the TV on these at each corner so the stand was slightly raised off the ground, unscrewed stand, pushed it off with my foot, then I lifted TV into foam bottom container (standing behind tv) and applied all foam padding, then slipped the box on top, laid it on the floor, put the carboard bottom in, taped it up and it's not stood up for 2 weeks in box waiting to be moved.