Any luck finding someone to install a stereo jack in the AUX port of your Base Fit?
I just got one (in the San Francisco Bay Area) and have been looking into this. In addition to the thread linked above I found this page (could be the same guy I didn't look that hard):
Honda Fit Aux Jack installed! - sowbug.org
I figure I'll give it a shot some time, but if I could find someone competent to do it, that might be better.
P.S. This is the first thread that came up when I used the search function.