Won't the controllers be happy with that idea!
Erm, wot's the problem? Was it this?
...give Ausfic a SARTIME for each leg of your flight...
Rather common practice & nothing wrong with it. And in an ideal world nothing to do with ATC coz it would be handled on the magnificent and extensive network of FW outlets or telephone or HF only.
No relevance to the unfortunate occupants of the C303 (sic) as it still would have been a sartime for YMER...