you could probably just take an active copy of a generic webadmin panel (css, js, markup, etc…) and host it with static values replacing any dynamically loaded content? Maybe make any buttons that perform page post operations src=‘#’ or something like that? I have not yet played around with any site code so it may be more complex than that, but I think even if it was you could go down this route to achieve the desired effect.

hope this helps, I love this company and these routers!
I have 2 and enjoy digging into all the possibilities they provide. you guys (and gals) do good work.