Hello
I can help you with your project to hide the URL of the iFrame, I can modify your htaccess file to internally rewrite a 'fake' URL to the real URL to cloak it. I do have over 20 years experience with Apache and so I can also optimise your existing code where necessary to help your server run at a higher performance.
For the second part of your project, if you can get back to me to clarify on that, if my understanding is correct and you do not want the iFrame source code to be included, then I can create a Javascript script to load and add the content outside of the HTML source code, this will have some drawbacks though, but will achieve the result, if this is what you want on the second part.
Thank you
Darren