My first suggestion would be to not do this the way you are planning. I would use (and I have used) Multilingual Press It basically uses WP multisite, it does not translate content for you it just keeps track of the how content is related from one site to the other and shows a widget for selecting the language and it keeps track of all the little details.
To do what you want to do using multiple fields would require using SESSION in PHP. Keeping track of what people have clicked and showing the correct content based on that. You might also want to consider automatically detecting the users language and showing the correct content.
