Script to apply character styles in GREP styles, then remove GREP

I have a long document with some fairly complicated GREP styles. They slow the program to a crawl and complicate it for the client I will eventually send the file to.

What I would like to do is run a script that will convert the GREP styles to normally applied character styles, then delete the GREP from the paragraph style. The document would look the same, but the GREP would be gone. I don't think I need to worry about character style conflicts.

Is there a script that can do that or a way to script it? I'm no scripter, so the only other option is multiple Find/Change steps.