That would be cool, both for a great story, and for opening people's eyes to the massive human trafficing problem many are unaware of.
But you'd need to include plenty of VO. What makes the (good) Punisher comics such great reads, is that he narrates his own adventures. We read his thoughts, and Castle's head is an interesting place.
The Thomas Jane film never felt like a Punisher story to me until he started writing the journal towards the end. (That film had other problems of course.)
As much as I'm looking forward to some crazy ultra-violence when I see this film, I don't think they'll even capture the feel of the better comics without including Frank's commentary. Like in the sample from this thread: "You have to be fucking kidding me. His next step is a reflex action." etc.