no stickers with BTC logo on your laptop
Not a bad idea. With this sticker, you can mislead anyone:

Hmm, that might work. You could also march right up the the customs official and immediately proclaim "there's no bitcoin here, officer. Nope, not a single satoshi."
I wonder how no one suggested using body cavities as a hiding place.
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Certainly safer and more comfortable than using your prison wallet.

if you are not stupid enough to write it on your forehead that you have bitcoins
This gets me thinking, tattoo your seed on the inside of your eyelids! Damn, I'm brilliant sometimes.
No one is going to steal your t-shirt
Are you sure about that?

After reading all the responses, if it were me I would just encrypt my seed with PGP and store it on my own cloud server (using nextcloud for example.) My funds would be in a wallet with a passphrase that I remember and wouldn't need to store digitally. That way I only have to remember my PGP password and my passphrase. Once I reach the destination I would move my funds to a seed that never saw the light of digitization.
For the duration of time it takes you to travel to your destination and preform the logistical steps to recover your funds, it's highly unlikely that some one would have the time to hack your server, crack your PGP, and and crack your passphrase. You wouldn't even have to use your own server, that's overkill. Google drive would suffice for that short of a period.