As I said, the macro code in the template is only available to the document if the template is available. That should not be an issue if you save the template in your local templates folder since, even within workgroups, other users don't ordinarily have such access.
But if you don't want to do that, simply save the blank as an ordinary document in your own folder and make sure both documents are open if you want to run the macro and that the document you want to work on is the active one. The only inconvenience is that you'll need to run the code from the VBE instead of from within the active document.
As for VBA project security, contrary to what you say it is fairly robust. Your deprecation of it, combined with your secretiveness about your code, suggests there is another motive. As an employee or contractor, any code you might develop is the intellectual property of the organization you're working for unless there is an employment/contract clause explicitly saying otherwise.