I've gone back and looked at RBNKs, and I've mostly figured it out. Here's the music from Pokemon Rumble with a soundfont. It's imperfect at the moment, but a huge breakthrough.
And all this time I've been playing with the Wiiware files...I plan on doing every game that uses RSEQ, though it'll take a little while for games with a bunch of banks. I've been using Brawlbox for now to help me sort stuff.