Quick navigation popup

In our application we need a "quick navigation" popup, which is similar to 
the "SelectPage" or "SiteMap" engine. 

The only additional requirement is, that only pages based on a certain 
template should be displayed. For instance we have "topic" pages (based on 
a topic template), which are organized in a tree structure (topics have 
sub-topics) and most of these topics also have "service" pages (based on a 
service template) underneath. In the "quick navigation" we would like to 
display only the "topic" pages (tree or flat view) without the "service" 
pages.

If pressed in the live mode, only approved pages should be displayed, 
while in edit or preview mode, this doesn't have to be checked. The 
displayed pages must be available in the users language. Also the ACL 
should be considered, so that the user will only see the pages, which he 
is allowed to read.

Do I have to develop my own engine for that with re-using some code of the 
"SiteMap" and "SelectPage" engine or should I enhance the mentioned 
engines or does it work already with using some parameters?

Greetings,
Benjamin Papez