I can try to make the intro font larger, but it might not be possible. I use a program that's an emulator for the OS that's in the games. It's nifty because it allows you to make large text documents like that as if you were really using the "terminal," but it's done via Dosbox, so options are little limited.
I debated doing voice-over or something like that, but I also think it could be very jarring for people who have "their" Courier in mind when watching. A lot of people get turned off when reading fanfics/seeing video of an avatar-style MC that overtly differs from theirs. There's risk/reward to the idea. Fallout also isn't big on character interaction -- even the permanent companions have limited dialogue. It's all about the world. That was the main motivation behind the survivalist's journal approach.
Inner monologue voice-overs could be possible, though setting up a quiet place to record is gonna be a challenge in a house occupied by 4.5 people and numerous dogs.
Another option: The Courier has a little floating robot companion named ED-E in New Vegas (who also has plenty of backstory in NV). Instead of just exploring, I could have the Courier search for their missing robot pal through the ruins of Boston. There's a mod to add ED-E as a companion in Fallout 4. Or orchestrate a way to have the Courier well... be a courier and deliver something to Boston.
Actually, yes. I may actually do that and rework the intro text to be a little more inspiring/motivating. I might also add a closing journal entry to describe what the Courier's reflections / plans going forward (easy if I film the whole series at once, but I haven't filmed any beyond this one for testing purposes).