Grant access only to Ensemble Message Viewer

Hello.

I want to grant access only to the Message Viewer page to an specific user, in all Namespaces. I have created a rol with this privileges:

%Ens_MessageContent
%Ens_MessageHeader
%Ens_MessageTrace
%Ens_Portal

But if I want to see the list of messages, I have to grant SELECT access to the Ens.MessageHeader and Ens.MessageBody tables of each Namespace.

Is there anyway to grant access to this tables in all Namespaces at a time, even if new ones are created?

Thank you in advance.