@Kerry Beal Thanks! Wonderful experiment. I might have to get a Sumeet!
I tried a formula yesterday. Pulverized some sugar in the hotmix, added dextrose and combined on high speed. Drizzled from the top melted cocoa butter on low, mixed on high then added a drop of limoncello. Sift.
Formula was: powdered sugar 75.2%, dextrose 15%, melted cocoa butter 9%, vanilla alcohol 0.8%
It came pretty coarse, so that I used my sifter with larger net and could not control well the amount of sugar but anyway came very patchy, might be fine on a fruit tart but not on my cake with a pattern on top. I will try again today using my regular 10X with starch in it and see what happens.