I looked around in the code to find a way to get the phone journal completely unlocked with minimal steps required, and I have a working method.
First set the dev console to True in the \renpy\common\00console.rpy file. Open it with notepad and go to the 108th line. Replace config.console = False with config.console = True. You should now be able to open the console in-game using Shift+O shortcut. I think there's a walkthrough for this somewhere on f95 too.
In the console enter this command unlock_journal_replays('FutaName'). You have to enter this for each character's journal. For example, if I want to unlock Mallory's journal gallery I would enter:
unlock_journal_replays('Mallory')
After entering the command(s) for your futa(s) you should be able to see all the images and access all their journal pages.
This isn't enough on its own though, because Renpy can only actually replay scenes it has already played through. To solve this you can use a universal gallery unlocker.
I can't post links since I'm new, but you can find it by searching Google for "ugu.rpy". I used the Reddit post linking to gdrive, should be the first result. Just drop the rpy file from there into the \game\ folder.
Open your game and you should now be able to replay every scene in the journals you unlocked earlier.
