I need to duplicate the onepage checkout function in CE 1.3.3 and want to be able to access it via domain.com/index.php/checkout/onepage-variant in order to be able to customize onepage without disturbing the core onepage checkout files. This is is already in a dev environment and creating another store is not an option.
What would be the best way to approach this?
And advice will be greatly appreciated!
Edit: Just to clear things up further what I need is 2 functioning instances of onepage checkout. We're going to be doing testing based on 2 different customizations and see which one works best.