Great point! I could bring just the microSD and buy a RPi locally. Or not even the MicroSD, then buy everything locally and download the Arch image with a Nixpackage with the whole setup.
I don't know whether I am getting too paranoid, but I don't know what they might do with westerners in the future if they find with you a MicroSD or a phone with GrapheneOS.
Anyway, any solution for this specific situation will be valid for a future surveillance state West.
Just memorize the sha256 hash of the Arch. Oh but what operating system would you check the hash on? :-)
Ohh such a good question! haha I was wondering whether I could download Arch ISO with the normal Android I theoretically brought with me and flesh a MicroSD using the smartphone itself.
Well, regarding to download I could use Transmission or any torrent client for Android. For checking the sha256 hash I just did a quick test here and it's possible with Termux:
https://image.nostr.build/0336c498e4c5babb0627ac82e555d6cb517ee22def6c8afee1b84ad32c573984.jpg
The only open question now is whether I can flesh a MicroSD using Android, I will take a look at this specific topic and bring the answer later haha