Be able to disable the mark unread, message, copy message and report

I have set up a readonly channel and have removed permissions for everything that should allow modification and typing as far as I can gather. However, if an "everyone" user clicks on a message they still get options for
Mark Unread, Message, Copy Message and Report.

as it's a Readonly channel (used for announcements, help etc) I don’t really want "everyone" users to have any access other than reading it. 
A means of disabling these would be good.