Yeah, we were wondering somewhere above if replacing those key components would be enough, but didn't want to pull the trigger until I got some sort of confirmation as to whether that would be enough. The consensus seems to be that if you match the ECU / SKREEM / key, and match the trans (manual vs auto) and the engine (base vs supercharged) that it should work.

Status update: I found a compatible wrecked crossfire in a local junkyard and managed to swindle them out of the components for well less than half what ebay wants. They key is broken off in the ignition, but all I care about is the RFID chip matching the SKREEM and the SKREEN matching the ECU. Worth it to me for the learning experience, and I can probably sell the parts if it doesn't work. I will update this thread with the results once I get time to install the parts.