nested pier kernels?

I'm playing with an application where I *think* that I'd like to have nested Pier kernel instances ... I *would* like each instance to be somewhat independent in terms of design and content and authorization ... I realize I don't need nesting to that ... I can create multiple pier instances with a different path and I'm okay, however, I can't figure out how to get back to the "master pier" instance, once I dived into one of the "subsidiary instances". I'd like to have a menu item entitled 'Home' that takes me to the master, but my Pier2/Seaside3.0 foo does not appear strong enough to figure out how to do this sorta dynamically (I don't want to wire in an external link for example)... I assume that with nested pier kernels it would be relatively easy Thanks in advance, Dale