Temporarily moving 2 walls off of a slab
There are a number of good ways to do this. Here's the first to come to mind if you're hoping to keep the wall upright. No jacks involved. In my experience, they're more trouble than they're worth when things are being moved laterally. 

I would separate the walls, if that's not difficult. A "cats paw" nail removal tool and a few minutes would probably do the job. You could cut the nails, but you'll have scarring on the lumber, and sometimes that's more difficult than it sounds. This procedure should work well either way, though.


Place a series of 8-10' levers with fulcrums along the wall, perpendicular to it. 2x6 laid over would probably work well. The near end of the lever should be just below slab level. The lever height at the fulcrum should be roughly level with the new slab height. The fulcrum should be near the temporary resting position, 2-3' from the slab. There should be clearance under the far end of the levers to at or below grade near the slab.
With plenty of helpers, pry the wall off the slab onto the levers. Two people should have the sole duty of balancing the wall, which, if kept vertical, should be manageable. The others should monitor the levers and help pry. Flatbars driven under the wall and then lifted should make this step easy.
Once the wall is completely off the slab, helpers should stand on the levers to lift the wall to the new height. This should be easy for average adults if there are enough levers (three or four per wall). The far ends of the levers should be a few inches below the height at the fulcrums, so that there's a slight rise to the new slab location.
Now place blocking under the near ends of the levers, next to the slab. Leave room for concrete forms, etc.
Shift the wall into its temporary position and brace well to heavy stakes in the ground. I'd use three if the wind is expected to remain calm, more if not. 


When time comes to replace the walls, the levers should be at a suitable height. Just slide the walls into position.

Of course, you could always just lay the walls over and drag them out of the way. If you have enough help this is feasible. Four to six healthy adults could handle the walls individually.

Also, consider leaving the original sill plates attached and just add new, treated 2x6 underneath, flush with the sheathing on the outside. If they're solid, don't waste the considerable effort to change them, or just change the bad portions.