Use [Ctrl]+[F2] - Access to top menu bar starting at the Apple icon and use the arrow keys to navigate.
Use [Ctrl]+[F8] - Access to the top right menu and use the arrow keys to navigate

Technical notes, and other ideas.
Use [Ctrl]+[F2] - Access to top menu bar starting at the Apple icon and use the arrow keys to navigate.
Use [Ctrl]+[F8] - Access to the top right menu and use the arrow keys to navigate