Since it totally passed my mind why I didn't initially do this, I've made a thread here to announce when I put up new Satellaview ROM releases on Satellablog;

[url]http://bsx.superfamicom.org/[/url]

Most of the ROM releases are 8M Memory Pack dumps by Matthew Callis which I research using limited Japanese knowledge.

Please feel free to run a search on ROMs on the blog to check out the back catalog. For now, though, I'll link this directory with Matthew Callis's latest find.

http://kiddocabbusses.tryhappy.net/puyo/

Puyo Puyo Tsuu BS Ban.
This one is most directly related to what Hidden-Palace covers because it is a "test version" (Demo!) of Super Puyo Puyo Tsuu, meaning there's a possibility it might have prototype material.

You can watch some gameplay footage here;
http://www.youtube.com/watch?v=nBAxnzit7aU