A few questions, two minutes. You get a link and a QR code to hand to your opponents - and you can change it any time.
Not because you are hiding anything, but because it never got written. It takes two minutes.
Same link, same QR, same answers. Neither of you has to remember what is on the other one.
Agree something new in October and you fix the card in two minutes. The link and the QR code stay the same.