Get a plumber to come over and do an estimate, any one worth his salt will actually know what they are doing. Remember some plumbers know how to pound out the concrete and lay the pipe back in properly, but not all.

I have had this happen at the plant I work at, one thing that is helpful to install if you do go to the work of tearing up concrete, put in an extra knock out. Or rather another point (like another drain) that you can snake out but you can cap it off until it’s needed. Just a thought.

Estimate first, if you need to feel more sane about the project get three estimates. Where I live there is a pretty good outfit called Quality Plumbing, don’t know if you want to try them.