It would be great to be able to add a check box in the 'My Account' view.
I'll put this forward as a feature request with the developers :)
We've since implemented this feature - see https://help.elvanto.com/using-elvanto/member-directory/setting-up-printing/how-to-set-up-the-member-directory/ for more information.
Also, I assume this only works for people with an active log in (i.e. volunteers)?