Not exactly (I think). 

If my live site looks like this:

I'd like to be able to have this on an external page:

Note how certain menu items are disabled on the external page. Basically, while the user navigates my site, I want them to stay connected to the basic elg functionality.

i kinda intentionally said " something similar to .. " ;-)
you do want want somethwang similar, but with extras..
the elgg.org topbar sorta disappears while in the @comm,
which has it's own topbar menu..
you want the connexn w/ yr @comm *all the time,
while moving between the strict 'elgg' areas and
other non-elgg areas of your whole setup.
if this is so -- i am sure it can be done with some
creativeness & imagination for the initial design of navigation.
i'll be doing this after/ when i have set up my own littwle
embracheee site for proper elgg tech & prods integration..
if i only had more time.. only time...;-oO one of these days;-O

Hehe...yeah...if I only understood the model more, I'd get this done. I've been hacking at it for 3 days straight and am at my wit's end right now.