I waited until I made a full working/booting backup and then went for it.
I followed your suggestions/guide and only needed to reinstall the audio side of MB6 for my motherboard. Once I got it it back to "normal" I then experimented with some odd issues.
1) I installed the HWMonitor and it's plug-ins but I can't them to work, however, iStatPro version 3 (!) still works so I'm not bothering to figure out HWMonitor.
2) I had to temporarily boot using a Clover USB drive in order to get my iWork and iMovie updates to download.
3) Speech & Dictation finally WORK! I checked ON the "Use Advanced Dictation" and after a short download the dictation now works beautifully! Now if I could remember to use it when I need to type (like here!)