Your "UA Trending Feed, PoC" is very cool. I think there are better, more complete, ways to implement what you've built (I completely understand you implementation strategy though), but as a PoC, it's great!

Looking at those posts in your "UA Trending List" and the order in which they're placed, I think it has potential to be implemented Steem-wide / Condenser-Native. Of course, it only (now) contains recent posts published by the @steem-ua delegators (which could be solved if all accounts delegate to @steem-ua :P )
Yet more realistically speaking (hey, one can dream, right!) a "UA Trending Feed" should include all accounts and all their posts. Every account does have a UA score, and so does every post, regardless whether those accounts are delegating to @steem-ua, or not.

I agree the current UA-API doesn't fit those requirements. Implementation-wise, I wouldn't recommend an infrastructure to deploy a UA Trending Feed being dependent on an external node and the UA-API. Instead, how about locally running the UA-Python Lib (sourced / linked-to in this post), circumventing Hivemind, and doing a UA Trending PoC based on all Live UA Data?

(PS: as you might know, I got tired of the "personal bashing" and "social / political quarrels" associated to UA / @steem-ua. Personally, I don't feel too comfortable going that route again by self-developing the UA Trending PoC as explained -- this is an understatement even. Yet I've always had nice talks with you, so if you're up for the challenge, I'd be happy to guide you towards an implementation as mentioned in this comment.)