I wrote a small VST plugin that allows you to send OSC messages directly from your DAW.
You setup the destination, select the min/max/steps values directly in the VST GUI and the value of the message is sent accordingly (scaling the automation curve in your DAW).
If someone is interested in testing it you can download the VST (windows) on this webpage : http://peter1island.com/technicalStuff/audio-plugin/vst2osc-rtas2osc.php
Unfortunately I don't own a mac so I haven't been able to provide an AU or mac VST version, if someone is interested in I'll upload soon a new version of the sources
The project is very young and I'm a composer, not a C++ coder, so every feedback is very welcome.
All the best,
Matthieu / Err0r_500