I would think it would be pretty easy to do as far as the coding goes (<- has no idea how to code), but think the swap out would be a little more difficult unless you keep both steemdollars and steemgold than it might be a little easier.
Just my two cents from a guy who has no idea how to actually make the change, but just thought I'd share ><. Great post!
Running them side by side would be the way to go. STEEM DOLLARS is an ideal Medium of Exchange while STEEM GOLD would be a better Store of Wealth so you could have the best of both worlds.