I would think ahead and do this job like a pro would.
There are actually two parts of the job. (1) Move the bricks from where they are to an out-of-the-way place so the patio can be poured, and (2) pick up the bricks from the intermediate location and move them to the place where they are going to be used for the patio and steps.
I would split each cube of bricks onto two pallets. You may be able to pick them all up and move them to the intermediate location as cubes, but positioning them for minimum labor in the second part of the job is going to require a lot more finesse than just picking them up and moving them with the 3 PT hitch. This gets the weight of each pallet down to the point where it can easily be picked up with your new forks. And easily placed.
I don't think it is possible to put 1/2 of a cube on a pallet and then pick up the remainder of the cube with forks. The cube is held together with the steel bands, usually with a row of bricks below the holes the forks go into. When you try to move the collection of loosely stacked bricks and steel bands, it is going to fall apart and you will look like a doofus in front of your MIL. This is the stuff of domestic disharmony.
Re-stacking 3000+ pounds of bricks on two pallets is not a fast and easy job, especially when you do it four times. Get a couple of day laborers to do this for you while you watch and then move the pallets with the tractor.
When you plan the patio and the steps, plan a route for your tractor to carry the pallets of bricks to their final staging points. Don't drive on the patio, and don't put the bricks on the patio. Cracking the patio is not an acceptable outcome. Plan a route to get your tractor back to the driveway for its trip back home.