@Datalight 

Yes, the Unity Catalog + Delta Sharing approach I outlined works even if the provider and recipient are in completely different Azure accounts (or even different clouds),
as long as a below few conditions are met :
1. Unity Catalog Enabled in Both Workspaces
2. Share & Recipient Configuration
3. Networking & Firewall Rules
4. Permissions
5. Data Format & Features
6. Supported Regions