There is precedent for featuring outer material. I also think that in general the criterion for featurability should be the measure of "is the author a community member", not location of the material. It would be at least counterproductive to exclude known instances of good work from featuring because the author has had it stored elsewhere for a long time, especially since the point of featuring is partially to expose newcomers to, as it were, shining exemplars of the craft.

tl;dr I second this suggestion

(Ang's script is still under nomination from my side if ever she should resurface from her CS degree with enough free time to write a front-page blurb)