Home Improvement Questions? Ask a Handyman for Answers
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This is a rather unusual request but there may be an alternative. Consult a chimney lining service that uses a cement based product not a stainless liner. When they line a chimney they insert a long inflatable tube then pour cement around the outside of the tube sealing and lining the chimney. The same approach with some modifications could work for you. You might have to open up the floor of the fire place but that's a lot less involved than tearing out the chimney. One other option would be to open up the block wall in the basement and seal any cracks with epoxy or urethane injection. Since you aren't sure what the cause is (may not be a cracked foundation) I'd look into the chimney liner approach first
You're welcome. Yes chimney liners are above the firebox but the same technique might be modified for you purpose.