I feel Hotrod Lincoln's reply is right on, I was actually going to quote it and say something like "here's your answer".
Surprised to read a couple post later that you think he's being hard on you and non helpful. Please try reading it again.
True that the correct wheels for the application will be simpler, safer, easier, and cheaper.
I've also been called a "Professional Machinist" and the job you describe of welding and re-drilling lug bolt holes in a rim is not one I'd take on. To much risk and to much work for what you get when it's done, buy the right wheel to start with.
Accuride did/does make the very wheels you need and I'm absolutely sure you can find some with a little searching.
One place to try among all the local junkyards is
http://www.wheelsnowinc.com/Grigg
