I haven't removed tile in a rig but used to do a LOT of this kind of work in homes. Something to think about... unless you can point to a specific instance that cracked a tile (like dropping something on that specific tile), the odds are good that you have an issue with the substrate like water intrusion between the tile and subfloor. In that case, find the source of water and bet on all of the tile between the cracked one and the source are soon to crack, also.
Now... to your actual question. Use a dremel (or similar) to remove grout from around damaged tile and cut into pieces, if it won't let go. You're right, pounding will do more damage than good to the surrounding... especially if there is a substrate issue. And... sure, a dremel will be slow. If you have them, an angle grinder with a diamond disk will be much faster. The point is: no pounding.
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2004 Damon Escaper LX400 4194
40' Diesel Pusher, Freightliner Chassis,
Cummins ISL 400hp
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