How to Alphabetical index of pages with template and level limitations

Hello,
 
I need to develop a alphabetical index of pages limited to pages of a certain template type ( theme ) and that are only at level 4. 
 
Which method is the best? 
 
- Rewrite EnginesRegistry.java  to add my engine and develop custom code to create a new engine
- Create a new SearchViewHandler and use Lucene Query to retrieve the results with a abcindex.jsp view
- Create a normal template and use custom tags 
- Create a normal template and use Container Query Tags ? If this solution, do you have an example with level and template filtering ? 
 
Please consider the cache issues since our jahia implementation will need to support heavy loads.
 
Thank you in advance,
 
Benoit Pironet
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