It would be cool if there's a third PIN that can wipe the unpatriotic profile whilst showing the patriotic one.
So you use 1st pin for normal use, 2nd for downloading your flight details on patriot mode, and 3rd for unlocking to patriot mode whilst silently nuking unpatriotic data.
Or a PIN that just nukes the data for certain apps (Signal, Telegram, WhatsApp, E-mail) etc. Feds can read my Slack messages all day.
Regarding Signal, Telegram, and WhatApp:
1. Never ever have Signal installed on the phone during border crossing. The presence of the app itself may trigger them (speaking from first-hand experience).
2. Having an empty Telegram account may look suspicious. My recommendation is to have two separate Telegram accounts, with the "unpatriotic" one in the separate profile only.
3. Never ever use WhatsApp for anything "unpatriotic". It's way of deleting messages leaves traces ("This message has been deleted") which may rise suspicions.
As for email, I just don't have any email clients installed on my "patriotic" profile. They all go to the "unpatriotic" one.
There's no PIN for deleting a particular profile, but you can quickly delete it manually, assuming that you have some private time available – for example, when you are stopped at passport control and told to wait in the waiting area.