Glad to hear it :)
Re: "my motivational system is broken, I'll try to fix it" as the thing to say as an externalist realist: I think this makes sense as a response. The main thing that seems weird to me is the idea that you're fundamentally "cut off" from seeing what's good about helium, even though there's nothing you don't understand about reality. But it's a weird case to imagine, and the relevant notions of "cut off" and "understanding" are tricky.
Thanks for reading. Re: your version of anti-realism: is "I should create flourishing (or whatever your endorsed theory says)" in your mouth/from your perspective true, or not truth-apt?
To me Clippy's having or not having a moral theory doesn't seem very central. E.g., we can imagine versions in which Clippy (or some other human agent) is quite moralizing, non-specific, universal, etc about clipping, maximizing pain, or whatever.