I see that Excalibur doesn't allow for Change Workspace command to be utilised in user command (*note to myself: fix it)
For now I think you can create simple macro that will press two shortcuts (both of them should be assigned in Premiere's Keyboard Shortcuts menu):
- shortcut for track height preset (this goes first because you will need to keep your timeline in focus to make it work)
- shortcut for workspace (e.g. Audio)
Then you can call this command with a search bar or assign another shortcut to it (we need more shortcuts 😅)