Here's a quick workflow that uses Omnifocus' built-in parsing syntax (the kind that is used for Omnifocus Mail Rules: @ for context, > for project, # for start or end time). You can edit the applescript to add whatever context or project specific stuff you want. Hope this is useful!
From bnmnetp's suggestion, I added Subtext that summarizes the syntax. I also added two others for oft-used contexts (Waiting and Assignments), but you can delete or edit those at will.
Edited by tsvoronos, 18 March 2013 - 03:58 PM.