You should look into Tails.
It's a Linux Distro meant to be carried on an USB stick and works via Tor. USB sticks are surprisingly large and cheap these days. Nobody looks at an USB stick at the border. Just put it in a random pocket together with a pack of gums or something, nobody cares to llok.
And if they do they'll plug it in their Windows laptop and just see a bunch of technical /bin /etc /lib etc. folders that they don't understand. And your important files are encrypted anyways.
I'm familiar with Tails but I'm not sure it will help in terms of setting up a laptop for daily work (video conferencing, email, coding / development etc).
Also it doesn't solve the mobile issue (2FA, contacts, messaging apps etc).
Wiping the device and having a decoy account is easy.
Restoring everything (including 2FA, apps, bitcoin wallets etc) is the hard / time consuming part, at least to do so in a secure way.
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