Restrict category access on front-end

I have a WP site that is a company portal and access is limited to only registered users. We would like to be able to send potential customers and sales associates to the portal but there is a category that we don’t want them to have access to.

‘Role Scoper’ seems total overkill and I have been unable to get the author to write me back. I found ‘Restrict Categories’ which seemed perfect but is only for the back-end, so not perfect at all. Any plugin that restricts based on whether or not the user is registered doesn’t work because we will give the prospect a log-in to peruse the site. I.E., there are no unregistered viewers.

Any thoughts or ideas? I’ve even thought of duplicating the site in a sub-directory and just omitting that category all-together. Seems drastic though.

Thanks