You would have to do two translations--
First, you would need to convert your acidized .Wav files into Rex2 files. An application like ReCycle can help you do that.
Second, you need to use the S.A.G.E. application that comes with Stylus RMX to import the Rex2 files into RMX. Also, you have to follow their directory structure when you do that second step.
It's sounds like a bit of a chore. However, I have found some Rex2 libraries that imported into Stylus pretty easily and have a pretty good library at this point.