@xeroc - I came across this post yesterday. I don't have as good of an understanding of the technical details behind how it all works. Would this potentially be a solution to the problem? The main downside I see is that it would probably require the user's browser to remain open and logged in to the site for it to work.

https://steemit.com/steemit/@digital-wisdom/introducing-steem-browsifier-full-access-to-the-steem-api-from-the-browser