Apologies my posts wasn't very clear.
To have Chrome as the default browser but use IE in Metro is quite easy to do.
First I'm assuming you already have Chrome as your default browser. If this is the case then you must make sure that IE is the default for this process to work. (you only need to change it back to IE so we can access certain settings)
Now making sure IE is the default browser click on the chrome browser to open it. When it opens you'll be asked if you want to make it the default like so: View attachment 1358
Click 'Set as default' and you'll see a different box open, now this is the important bit, make sure you click IE, like so: View attachment 1359
Once clicked you should now have chrome as the default but with IE being used in Metro. I should also mention that this will also mean that if you click on a link in an email lets say then it will be IE that opens and not chrome.