I don't think so. The exit wound and decomp present when they found his body indicated that it was a human body. Besides, why kill your host copy and have your aging 80+ year-old human body live on? Killing your human body and transplanting your consciousness into an immortal host body makes a lot more sense.
Of course, there appears to be a fairly short time window between William's final meeting with James Delos' copy, Bernard's first visit where he prints a control unit and kills everyone there, and the gala massacre. Presumably, if Ford had found out about the project he would have also known that it hadn't worked, and it doesn't seem like he would have had the time to work out the bugs himself before implementing his "final solution." Though, maybe he had known longer and had been secretly working on solving the problem himself for some time. Regardless, my guess is that the control unit Bernard pocketed was destined for the host body Ford was building in his own secret facility where Bernard killed Theresa. Who that host body will turn out to be is anyone's guess, though Ford is the most obvious.
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