Yes, actually. While
Unfavourable Outcome works as a oneshot it could also work as chapter one to an epic and fun-filled adventure!

Is that the one where the S9 "save" Taylor? I was definitely not thinking of that one

probably won't be interested in a continuation unless someone (wouldn't put it beyond Ack) manages to fill it with enough fun to make it a comedy (by which point it's probably going to be a crack fic). I'd expect the continuation, if it ever arrives, to be a more standard "being Wormverse is suffering" fic, however.
In retrospect, I might not have been thinking of actual done oneshots (though those too perhaps if I check the Omake Corner carefully), but of ideas that didn't even make it that far (such as that one chibi-Contessa story).
I just don't see the point in indicating that you'd like to see a continuation of a complete story with no dangling plot threads. Even you admitted that I, Scion would be hard continue, but for some reason want to see more of it anyway. What about it makes you feel that it's incomplete and there's more story left to tell? And with All Unaware I suppose that I could see a continuation that explores how the stations of canon are changed by Brian having Aisha's power, but that sounds a bit boring by itself. It even sounds a bit boring with sex included.
I can't actually recall how did All Unaware end - was it this, or some other, Ack fic (or not an Ack fic at all? I recall it being on AO3) where the author specifically claimed that they had to adjust the canon timeline because in canon the Undersiders would've been too busy? (Would the Undersiders even exist with an Imp!Brian? I can't recall whether they did in the story.)
I do recall that I found the conclusion unsatisfying and tacked-on. But it could have easily been "the stations of canon are fast approaching, and they would mess with the story too much, so it has to be ended in
some way". (As it was, IIRC, the story was pretty much canon-compatible as far as Taylor was concerned. I might be mistaken, however.)
As for I, Scion... it was very short, and didn't really have much happening. That's it, I think. It felt like a parody of overpowered SIs by explaining how they should actually fix everything very quickly (that might have also been what it actually was, which would explain the shortness).
Just to clarify when I said that both fics had no story left to tell I didn't mean that continuations would be impossible, I meant they function as self-contained narratives with no sequel hooks or loose ends. The idea that every Wormfic has to go on until Gold Morning has lead many stories to wither and die as the author looses interest and/or runs out of ideas.
That or tack on an early explanation of why Gold Morning will not happen. (Though many non-Ack fics - and the occasional Ack fic, Trump Card comes to mind - deal with it by being so slow that even the Leviathan fight is very far away.)