This smells like over-engineering to me...

In my experience, including rendering code both server-side and client-side is overkill. Just put all the rendering and templating code client-side, period.

If you want your page to appear more quickly, then instead of loading content data with AJAX afterwards, just include JSON arrays of content directly within the HTML source itself, and use JavaScript to populate the page instantly, even as it loads.

(Obviously SEO is a different case, but there are tools built for that specifically.)