I expect it's possible to learn to successfully simulate social curiosity

What makes you think so? Hope? I suspect most Asperger's types who learn to engage in conversation don't simulate social curiosity, they developed it.

Think of this as pinning your hopes on AIXI when instead you could be better off employing some domain specific hack of a cognitive algorithm.

Also, from signaling considerations, faking social curiosity should be difficult, as the signal wouldn't be reliable otherwise.