What would be wrong with a couple hundred guys sending this to a DP flyer:
Dear XXXXXXXX
I read your name on a list of pilots voluntarily flying pairing 123. As you know the company and the union have agreed to dispute this pairing. Since your voluntary actions will, in all probability, lead to me eventually being forced to fly this onerous trip; my I ask you how did it go? Should we tell those scheduling experts in the SIG they are wrong?
Please let me know soonest, and I will forward your comments to all my other friends heping to keep the Purple Promise.
In Unity,
Your Name Here
The last sentence is in case you want to use the company e mail.