Hello, WOW... I feel your pain. In 30 yrs of plumbing and construction I have never seen so much concrete around a drain before. Its usually the contractor skimps on the concrete. This guy must of had a lot of cash or owned the concrete plant to pour his much crete! However, how about renting a bigger electric jack hammer, 40-80#? This will bust things up a bit faster. There is no faster way to bust concrete
Make sure once you bust it all out, be sure not to puncture any pipes below...then you will be busting more crete. After you relocate you plumbing as needed all you need to do is build a box 12"x12" around the vertical pipe and pour new crete to it. backfill rest with good dirt or sand. I have seen alot of basement bath rough ins and the idiot contractors pour concrete tight against the pipe. Goes to show you no one thinks ahead or into the future. I feel fo you...get a BIG Jack Hammer, call a few friends over for a busting up party...make the best of a bad situation. I also see you have ABS pipe, be careful this tends to be a bit more brittle once exposed to concretes chemicals. Good luck!