I'd think that the 301 redirects coming from the page instead of the .htaccess file will do the trick; but it depends on your server and php version. Wiser heads than mine will have to expound on that.

The liquid design issue, though, I can pitch my two cents into. The fact is, there's a multitude of ways you can attempt to resolve this--css, or detection scripts, or flash-driven templates; but the fact is that people with large screens are aware of the fact, and frequently will have things set the way they like them to be. So program to what makes you happy, but there's no real need to be overzealous unless you're specifically targeting that market. Make sure your site follows best practices where accessibility is concerned (Web Accessibility Initiative (WAI) - home page) and you'll be fine.