SSI conditionals AFTER apache auth?

Evening everyone,

I'm trying to make it so that only certain elements on a web page are
visible to users logged in, and are otherwise not displayed using
mod_include flow control
The only way I've been able to do that so far is to detect the cookie
that the apache auth sets, which works sort of. Of course if I just
manually set the cookie in my browser then the stuff shows and just
confuses the whole setup I put. I know from reading the docs that
%{REMOTE_USER} isn't exposed to these conditionals due to the order of
operations. However, it'd be super-cool if it WERE. I know that filter
processing can be tweaked to a degree with mod_filter, so I'm wondering
if I can instruct apache to process authentication ahead of mod_include?
I couldn't find anything directly saying yes or no, so figured I'd see
if anyone on here knew one way or the other, or see if anyone had any
other suggestions for accomplishing what I'm looking for.

Appreciate your help!