Hello there Jacqdiva, in down under.... sheesh -- when I was 11-years old til age 13, my family lived in Brisbane (St. Lucia) -- and the second year we were there my brother and I attended St. Peter's Lutheran College as boarding school kids. (Indooroopilly) It's funny because SPLC was a bit like Hogwarts - school uniforms, the girls wore neck ties in their Sunday dress uniforms etc. -- that was sooooooooooo long ago though. Loved it. The money in those days was pounds-shillings-pence, I think now you have Australian dollars. The ferry boat across the river cost 1 pence. The bus was -- 3 pence I think -- and I think there was even a little tiny coin that was 3 pence. Walk home from school and spend your 3 pence on an icecream, or ride the bus. I think the tram was 6 pence and the train was 8 pence for every station...so 3 stations would be about a florin for the ticket. Ask your grandparents about the 'good old days'. I never want to go back to see the modernization of Australia- when we lived there, it was before Brisbane had TV. Way back in the day. I loved it. But I digress.
Oh, and I'm watching the series 'Miss Fischer's Murder Mysteries' on Netflix - Melbourne in the 1920's. 1929 in the recent episodes I'm seeing.
My knowledge of Silkies is less than zero. Here is a guess. I'm pretty sure that lavender silkies are available...that would probably be your starting point. Then cross with a barred or cuckoo bird OR cross with a duckwing bird. If silkies come in that color you are closer - but if you have to outcross to a different breed, then you will have many crosses to get there.
If you start this project -- best of luck. Post any pictures of your journey here that you wish!

ETA - I guess actually you would speed your process up if you crossed lavender with a gold-crele. That bird would have both barring and duckwing.... There are gold crele OEGB here in the USA. None of your first generation would show lavender, but they would be split for lavender. Breed thoes to each other, and select the lavenders and the barred. Silkies are really way more complex though aren't they? 5 toes instead of 4 toes, black skin, And the feathering is recessive -- so you would appear in your first generation to loose that furry silky-look.
If you are familiar with Classroom in the Coop website -- that's where the genetics experts hang out -- and they may be able to give greater/deeper insight.