>This means if you go on a trip somewhere you absolutely need two devices

If you want multi-device redundancy, you have to carry a second device of some type, it's hard to get around that. I almost always travel with an iPad in addition to my phone, so I have a second device.

In addition, my wife (who travels with me so if my iPhone is stolen, hers might be too) is one of my Apple account recovery contacts, plus I've set my sister as an addtional recovery contact, so even if I'm out of the country and I have to activate a new iPhone, I can call her to help with the recovery. So all I have to do is find an Apple store and buy a new phone.

I also carry a USB key tucked into my luggage with the recovery kit (encrypted) for 1Password so I can activate 1Password on any new device and have access to my passwords and whatever passkeys I don't have in iCloud.