I finally allocated the time to solder this on. The enameled wire I've purchased was too thin, so I reached for the leftover clipped leads from through-hole LEDs.

It takes some tweaking to get the length and angle right, but it is cakewalk overall (especially with a newly replaced iron tip ^ ^).

The speaker's single side of connection did not feel secure enough; it seemed that the soldering pads might get pulled off anytime soon. I finally resorted to electrical tape again, but I don't think this is the best way. I need some inspiration >_<