I’m beyond tricky and clever somewhere approaching creative and inventive. Wood stoves are normally only direct radiation devices if you have one with a boiler your lucky. I don’t have a good place for a wood stove and because of their heat distribution limitations it’s not feasible for me. But I do have two fire places and I could convert the one in the basement for hot water in the method I proposed. That could be tied into the current hot water pipes or run through the extra tank for a larger supply.
If you wanted extra hot water capacity it really would not be hard to convert a 55 gallon plastic drum into a holding tank. Using a recirculating system run through the radiator and the drum. Of course I would conduct a test by boiling a few pieces of drum to see what happens first, but they are amazingly tough, I have no doubt they can withstand 150 degrees or so.