Just bust it out. Sledge will break that up quick. Crete is cheap. Your foundation walls can act like the frame. Throw down a little stone where needed. Compact it down. Then fill it up with new Crete. No saw joints just joint it with a finishing joint. Expansion the edges, throw in some wire or rebar. You're talking one days work and around $500 and its done. Or spend half a day. And $100 and it last for a year. 0.02
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When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11