For a urethane I would use an aircraft stripper. I would use a water wash remover and keep it wet with remover until it disolves the finish all the way down to the wood. You might use a scrub brush or a brass stripping brush to get into the details of the carving. Removers evaporate pretty quickly so you might limit how much of it you strip at one time. When the finish is ready to come off you won't be able to scrape it off like open flat areas. I would use a power washer to remove the residue and finish that was 1500 psi or lower. I and have stripped hundreds of pieces of furniture and it does no damage to the wood, veneer or joints.