It looks as though there may be a solution on the horizon, and it may have nothing to do with Microsoft. Someone is developing a solution that can intercept DirectWrite requests and modify them.
https://sites.google.com/a/softwareninjas.ca/www/home?pli=1
He's using it to turn off ClearType completely, but he got the idea from Firefox's Anti-Aliasing Tuner, which let's you customize any aspect of it you want, including changing directwrite requests to RGB ClearType rendering, enhancing gamma, contrast,
etc. He's currently working on a solution that will work with IE 10, he had one that worked on IE 9 and any app that relied on IE9's rendering engine.
So I tweeted him with a link to this thread and said he could make a killing for a $20 modified version of his program that could intercept ClearType requests from other apps, in particular Office 2013, and customize the Cleartype style. He re-tweeted
it later that day. I can only hope that means he agrees and is working in that direction.
Now this sounds like progress! Fantastic!!