@Mark. Don't want to go against you. Because all the advise you give is very good. You have alot of insight in this. And i personally find exposure a very good therapy. But from what i can read so far exposure in vivo would be to soon. I would recommend rescripting first with progressive relaxation first. Then imaginary exposure before doing exposure in vivo because it can retraumatize someone if done too soon. As long as the trauma isn't rescripted in the mind the triggers will stay. And people need to learn to cope with episodes first before doing exposure.
Older textbooks did dictate doing immediate exposure as soon as possible after trauma but now research shows that it is just retraumatizing people.