I think in the best technical way to get through without the agents being able to detect that you have a single satoshi. The most logical would be to memorize the seeds but relying on memory would not leave me 100% at ease. Is there another feasible, safe way?
Get a paper book (one you would read on a plane) and look for the words in the seed and underline them, one word per page, use a pencil so it's not so obvious. then write down the page numbers in a tiny notebook inconspicously in the order of the seed words. Walk through customs with the book in your hand luggage and put the notepad in your checked baggage. When you arrive at your destination you can put your seed back together. Even if your luggage gets seized or stolen you won't likely lose your bitcoins if you also have the seed backed up somewhere else.