Around the time it was released I tried to interest people in Kuhn's https://www.cl.cam.ac.uk/~mgk25/otpw.html for those travelling and wanting SSH access to the site from potentially-dodgy systems. Still, without your own device you may not be able even to use hardware keys. If the client is untrustworthy, you do still might worry about the channel being open from it to the other end.