As far as I recall, there has been no reference to High
>School Musical or the twee-boy/girl/band/child-slaves in UF. So I
>think it doesn't work.

...Only because they're not accepting new authors. Alas, the world will never see my Hanna Montana/Jonas Brothers Lensmen Two-in-One comic.

Jumping back on-topic, I reckon the works of A.A. Milne are still fiction, judging by the reaction to Nall's Tigger costume in SotS.