Can I create concrete driveway with forms to get the paver stone look without the need for all the aggregate beneath?
If this was just a patio I'd say you have a good chance of getting some satisfactory results except for the fact that it would be about 2.5" above grade and there's be the possibility of tripping over it. This is a parking lot and driveway. You'll have cars driving over these slabs and parking on them. They will be shifting and sinking because of the weight and cracking. Rain will probably erode the ground between the slabs causing further movement. Doing it piecemeal will also cause some problems establishing final grade as you proceed. I think you need to bite the bullet and remove the extra ground and install a proper base.