Thanks a lot for your answer.
The thing is, I am quite sure that Google play magazines is supposed to work with restricted accounts, just like the music and books app do too.
I added a screenshot from my Nexus 10 showing the settings screen for the restricted user`s app permissions.
About the workaround: I assume that a separate user account with it's own gmail address would not be able to show my magazines subscriptions, and therefore not really fix my issue here...
Thanks again for your response.