Hey Philippo,
Welcome to these parts, glad to hear you’ve been using Speckle for a while as well!
I’m afraid there is no way currently to set design options, phases or worksets when receiving. There is though, a PR in progress from a community member to support phases.
It sounds like something relatively doable thought, we will check internally how to support that, here is an issue you can follow: Add support for phases, design options and worksets · Issue #1546 · specklesystems/speckle-sharp · GitHub
PS feel free to Introduce yourself 
if you’d like!