Map portals used on campaign

Just wanted to throw this idea out there. I'm really enjoying the campaign, so much so that I find myself rolling new characters as soon as I get to maps just to be able to keep playing it. It would be cool if we could just keep replaying the campaign at harder difficulties. Like in addition to using a Waystone to open a portal to a map, we have the option to use a Campaign Waystone that allows us to modify and scale up versions of the campaign?