Option 1 and 2.
With possible customizations.
Sway is a great potential, if you only profile it slightly in public categories and private profiles it can easily be new "Medium" just better, as people can have publicly available texts in some containers, as well as private things shareable with friends
/ family only.
Like, I have my travel blog on my own domain, but sometimes I'd like to write about different things that simply do not belong to my blog. Sway could be perfect place for it, but would need to be "public community" or "medium" as Medium is now.
So:
www.sway.com/public-tech-category/My-Thoughts-About-Sway-[timestamp] -as a public text
www.sway.com/p/[username]/How-I-met-your-mother - which is obviously a private post
or: mydomain/p/How-I-met-your-mother
Now, if you like my idea - What I miss on Medium is "Alias", and they already exist on MS profiles.
Embed it into Sway, give people a chance to use one account but have multiple profiles. So for example:
Ivan the terrible - tech guy, writing about tech
Alias Johny Memorable - Writing love poems.
Such a great potential, looking forward to see it in action! :)