Hello, I could do a simple prototype of the functionality described! It would be a fairly barebone solution, but will show the result as described. I will need the list of the words to be ignored an of course whether you want the search words ignored. But this is a small thing that can be adjusted in the last moment. I have extensive knowledge of php-programming and I am core programmer on another open source cms, but I know WP well as well.
And as answer to your question, yes, the system will only need to load the plain html, not css or other external files like javascript.
/Morten