If I can't find anything to make my indicator lights brighter, I may ask if you can give details on your diagram above. Not sure about the timer part but the rest sounds like the stock BMW setup that only beeped/buzzed if you left them on when you were riding.
FYI - For anyone looking at the turn signal LED's linked above, I was able to find the lights on eBay for about 1/2 of what they are in the stores and the relay was available at O'Reilly's, right on the shelf. (Got the parts, haven't installed yet so can't report on that).