CodeWarrior is readily available from abandonware sites, and can be used inside 10.5/10.6 on VMware Fusion if you don't have any PPC hardware around. Older versions of Xcode (2.x) can then import CW projects, you can swap in open-powerplant, and do an Intel build. Let me know if you want any help/advice
This is actually what I was trying! Perhaps I can dump this all into a GitHub repo and we could collaborate. E-Mail in my profile if you are interested.