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Best option for sealing the ends based on the above list would be tung oil. And I only say that because it does have a drying agent that would work if enough coats were applied. There are better, low cost options such as glue, Elmer's that is or any kind of wood glue. Still better options than that but I wouldn't worry too much about the Hickory, it still needs be sealed thou to slow down the moisture loss. I don't see wax as an option.
I have not needed to seal the back of Hickory, but I have heard of folks that live in lower RH regions feeling the need.
Agree with Pappy: additional moisture will be lost as the bow is sized down to final dimension which should occur pretty quick at that point.
I see no advantage to quick drying in a car based on the ambient temps provided. As recommended by other posters , cool, dry air may be the best option. AC or not, sounds like your best option is indoors. If no AC is available, use a fan for air flow in the warmest room in the house. Cool air tends to be at a lower RH but depends on your surroundings. Pappy's 6 week estimate without using a hot box sounds very close to me.
There will be much to learn about moisture, Hickory will be your best teacher.