Sometimes I put loading ramps on the tailgate of a truck or on a brick wall. Then i drive up them until the mower is steep enough to get under. Then i put on the brake and put a block or something behind the back tire to stop it from rolling. As long as your careful you shouldn't have any problems.
You better check again, it doesn't matter what size the cut, it's the distance between or of the front wheels and width of your mower is 54.6 with the Deflector Up and that will be wider than the front wheels. Your front Wheel outside span measurement should be around 42". The EZ fits my 48" cut with room to spare.
Is there any kind of safety stands or something for those jacks? It would appear to be somewhat unsafe to get under a deck and rock it around loosing up the blades? Just Asking!