Figured I'd post my experience with this.
I went through the process defined by XDA. Worked ok and I updated my PRL to 60659. Worked fine. Couple of side notes. You need to uncheck USB debugging in <Settings><Applications><Development> on the phone. Also, when adding the new port in step 9 you need to make sure you uncheck "Show Serial and USB/QC Diagnostic ports only". My computer showed COM3, COM6 and COM7. I added each. Only COM6 showed as having a phone so I deleted the others.
In the end, my reception didn't seem any better with my former favorite PRL, 60659 so I went ahead and used the regular phone process to update the PRL and it did so back to 60674. I am using Midnight ROM v2.3 EXT4.
Now I know how to do it if I decide to.