Yikes. I have been very impressed with what HP has been doing lately, so it would be a shame to see a repeat of the 747s-to-Japan debacle (or similar).
That said, 767s might not be a terrible idea for the new transcon nonstops, or any other routes that could support extra capacity, but I would think that the -300 would have better seat-mile costs than the -200. And, speaking of -300s, the 757-300, with its dirt-cheap operating costs and commonality with HP's existing fleet, might be an even better way to add capacity. Now that Boeing is talking about shutting down the 757 line, I bet they'd practically pay HP to take some.