We got it up and running yesterday, works fine :)
Edit: thanks for the feedback. As mentioned in the post (but which I could perhaps have highlighted even more) this is meant to be a proof of concept. I am more than happy to provide the card only with the requested account name and amount of steem, with no password written on it, for someone who would like one to give the card and then do the account set up and transfers themselves.
Any other comments on the general idea are also welcome.