I like your determination. I have tried quite a bit of these techniques myself. I also took advice from some RBN authors on contacting artists (I contacted over 50 Japanese bands). I love all the bands mentioned here & contacted some of them as well. I have also requested artists but I admit contacting them via their websites (or MySpace, Facebook or other sites if contact page can't be fund) has become my favorite way because it let's the bands know we are interested.
I wanted to spread this idea to you because I can tell you are determined & is a true fan of Japanese music. I believe that the more who contact these bands the better as it will show them how much we love their music. Cool forum, you rock! Have a good one & Happy Halloween weekend ^_^
EDIT: Oh yeah, I forgot to mention something... I offered up this link to the artists when I contacted them http://creators.rockband.com/ which is where artists can add their songs to the Rock Band Network for Rock Band. But after a RBN author told me where he sent a band that needed help, I realized that http://offbeat-entertainment.com/default.aspx is perhaps better since it's easier I think. Oh yeah, I also voted ^_^