Well this has certainly turned into my personal blog. I found some interesting information, however.
Since I have not actually seen
the SIB that Evan kindly referred to me, I thought searching the forum may yield results.
Instead I happened upon this thread
Now you may wonder what shaking xenons has to do with the bluetooth retrofit? Nothing, but in the OP I saw this link:
which made me wonder what would happen if I simply substituted for:
and guess what? it worked and so I also found the consquent referred pdf in the bulletin:
It gets better. My package from bimmernav today arrived today. The included unit was NOT ULF but rather TCU--the EXACT SAME part # Evan@Tischer provided. Refer to my OP.
The included instructions were the EXACT SAME as from the PDF above. All for ~$750.