Just have the liners knocked out
Yeah. I think I'm going to have the mason do that when he raised the chimney a few blocks to bring it up to code. He does that a lot for the supaflue install, but will probably just run a rigid liner instead.
My local shop said they just have the rigid pipe stick out of the concrete block however far is needed to meet code. Is that possible? I thought it would look kind of wonky to have 1-2 ft of pipe sticking out the top of the block.