Another option is a DIY 7-pin toslink cable. There's directions on here and on oade's, or Fozzy will probably make you one if you ask nicely. Here's Fozzy's and a right angle toslink -> mini cable from SP.
Her's the whole setup, including my DIY voltage regulator so I could run the jb3 off of a walmart battery. I also have a 9v output, which basically bypasses the voltage regulator circuit to power a PS2. Thanks to leegedy for all the help on this project.
I'm still carrying lead though, as it powers both the sbm-1 and D8, which I use to monitor levels, and possibly make a backup of.