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The motor from an existing hybrid is going to be the hardest to use because all of them that I've seen at least are designed to work as a whole unit, they are often built in to the transmission of the car, so removing that one part and putting it in something else is not practical, just like replacing the motor in a hybrid with an off the shelf motor would be nearly impossible.
Again, your first step is going to be figuring out where a motor can attach, as much as driving a rear wheel or both rear wheels seems like a great idea, it will also mean that you are designing and building a whole drive train for the rear of your car! the rear hubs that you have are not designed to be driven and if you pull a rear wheel off I'm going to bet that there is not much extra space back there, so while it would be the best, it's also going to be the hardest.
Because the suspension of the car has to move with the bumps in the road, the closer to a wheel you get the harder it is going to be to build a mechanical connection, that is why if a 4 wheel drive version of your car was built it would be easier, you buy a used rear wheel drive train and suddenly it's putting the drive shaft for the rear wheels in a nice stationary location, but that is not the case with the vehicle you have.
A mild hybrid might be the best idea, it would be the easiest for sure! open the hood on your car and look for a location on the engine where a power steering pump, air conditioner compressor, or something else could bolt on and have a clean straight shot to the crank shaft pulley, the electric motor would still need the gas engine turning while the electric motor is helping the car along, but it will be more like driving with a tail wind or down hill all of the time.
Also the two car batteries you have are most likely starting batteries, not deep cycle batteries and they are most likely different ages and sizes, so your total usefulness would be limited by the smallest or oldest battery, the rest of the other one would be dead weight.
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