Mark,
Good question and feedback. You can usually reduce it down to 4 touches by using this method. If you are zoomed out. It might add a touch as the software will prompt you for "near touch" airports.
- Touch and Hold the desired airport for the "Possible Action Menu".
- Touch Plates and Diagrams.
- Touch Approach Plates
- Select the desired plate.
This gives me an idea to reduce it to 2-3 touches. We could presume for airports in the Plan, and if accessing Plates and Diagrams from the Low IFR chart, that you want to see a list of Approach Plates. We could also simply list Airport Diagram, a "list" of Approach Plates and then show options to access the list of Departures, Stars, etc as available.
The History shortcut usually resolves this, but it does require you to look at that plate in advance. I've got some more ideas that I'll run over with the team.