From what I've read, Pass Key is relatively easy to bypass as it is, so I was okay with loosing it. IIRC a lot of the bypass modules just have you put a factory key into them so the Pass Key system is totally disabled all the time. There might be different bypass modules that do't do that, but I do remember seeing those. I can't tell how the one linked above works, but you probably have the best idea since you used to install them.