I've been addressing this by customizing the Task Form Templates (WC 10.2 M020). Guide and Help Center have some good info to get you started. I've ben working with Change Management and including Affected and resulting Objects tables in Task Forms so you can directly access data from the Task. In 9.1 I think you can include the entire Info Page to the effect of embedding the PBO in the Task Form. I'd be surprised if you can't include data elements from a Promotion Request.
I want to say I recall some indications from "the mother ship" (PTC) that an upcoming release (not sure if it's 10.3 or 10.2 @ M030) will make this much easier.