I know this is old, but I did find a hacky workaround for this that works pretty well in portal experiences. The crux of it is that when a required parameter changes the page automatically refreshes. So if you're routing to a page and want to get a new version you can pass that page a different parameter and you'll get a fresh copy of the page. The easiest way to make sure you're passing something unique is just to use a timestamp.
It's hacky, but it works.
It also sorta works for workspaces, but instead of refreshing an existing tab if opens a new tab with the new required parameter so you end up with multiple tabs of the same page, which may or may not be an issue.
I would also note that I've only gotten this to work with required params rather than optional.
