Re: 2FA
Oh, *that*! Yes, that does work quite well. I've been using token micro-boxes for multi-factor secure banking for years and those RSA things even longer. So far, no issues.
Losing the extra bit is a bit of a problem for those who lose things but I don't seem to be able to do this very often; even were one to, getting a replacement is a matter of a couple of days at most. Usually through snail-mail, which might be irony.