This is the correct take. Its common across various business contexts: destroying evidence after you learn you are being investigated is big time illegal. If you destroy data, you better be able to demonstrate you did so beforehand (I.e. an expiration policy), or you don’t have it in the first place (because sensitive data doesn’t touch a given mobile device and all.). Dedicated device for travelling is the best idea.

You could also take a video of yourself wiping the device before travelling for security in case it gets stolen. (Not a lawyer disclaimer).