I've been looking at the Glow2 & Glow3.
It looks like you might be able to do the same trick of adding an SD card on those too.
The Glow 2 has had its test points deciphered:
http://www.temblast.com/blogs/glow2/blog.htm#sdcard
The Glow3 seems to be strangely different, I'm still working on it.