The keystroke construction rules only apply to keystrokes that are shown in a shape in print. So those seeming keystrokes in your example are not transcribed according to §111d. The boldface numbers would not be enclosed in keystroke indicators because they are not presented within shapes in print. Follow Nemeth rules for indicating boldface. Yes, I would use the contracted right pointing arrow for the arrowhead shown in the key shape. The key strokes shown in print are irrelevant, but they should be explained on the TN page.
Remember that the graphing calculator material shown in a screen is not transcribed in Computer Braille Code.