What's the rules, is there anything you can't add? I've never really seen the point of sig drinks as a test of barista ability, what weighting are they given?
How about this:
Take 250g of fresh (just to the start of second crack) roasted single origin from your roaster
Put it is a jar to degass with 5 whole fresh Star Anise pods
Leave it degassing for 3 days
Remove star anise
Grind coffee and serve as an espresso with a swirl of sweetened cream
So basically just an espresso con pana made with beans that have absorbed a bit of the anise flavour, with a bit of sweetness in the cream.
But I fear I'm missing the point!