I just got something to work, it is much more mechanical, but for me simpler:
I am a bit of a browser junkie. So, along with Firefox as my default browser, I also have SeaMonkey (and IE8 and Chrome, but, who's counting). Both FF and SM make user id's and passwords very easy to control. So, I went into SM, got rid of all traces of Twitter, cookies, user id, password, and closed out. Then, I re-opened SM and went to the second Twitter page, established it as THE ONLY Twitter page this browser will see. (I am using SM right now.)
In my two blogs, MusicSprings, and ScienceSprings, I do not write so much as publicize. And, I do it from several sets of RSS feeds using Google's feed reader.
So, in music, I will use FF, I will open the feed readers for Jazz and New Music, write posts of album releases, Jazz and New Music concerts, etc, mostly copying and pasting text, graphics, etc. I will keep that Twitter page open, and mechanically "Tweet" from the post. I basically try to take news out to a wider world.
Science is in its own feed reader, which I will open in SM, and also that Twitter page in SM, and do basically the same thing. I get feeds from all of the D.O.E supported labs in the US, many physics departments at research universities, and a ton of stuff from CERN in Geneva ( you know, the LHC? Black Holes?). The deal is the same, hoping to raise the visibility of the US contribution to scientific research worldwide, taking the news to a wider world, I copy text, I have a huge inventory of images, etc, and I always give a link to the full article.
I killed Publicize for everything. Once the Twitter thing is straightened out, I will go back to Publicize for Facebook, which will only accept one blog anyhow and makes me use the Facebook share button in the posts from the other blog.
I finally got my first Tweet up on the ScienceSprings Twitter page. So, now I need to move all of those I follow from the original page, and ask my (myriad?) followers in science to move to the new page.
I read your description, my method is really no simpler, except that it is about second grade stuff, yours is more sophisticated.
BTW, you might be interested in the Science blog, sciencesprings-dot-wordpress-dot-com.
Thanks for your help, it is much appreciated.