Back when dinosaurs roamed the earth, F7 was the shortcut for Now = From. This would set your Now time to the beginning of a selected note or clip. I forget what the new hotkey is because I immediately rebound the old one when it changed in X1 (along with F8, F9, F10, Ctrl+F9 and Ctrl+F10).
This should take care of setting the Now time, and then you can use Alt+3 to open the PRV, but I'm not sure about getting the selected track to change in the PRV if it isn't already the one you're working. I'd have to experiment.
I do like using keyboard shortcuts as much as possible, but since most PRV editing requires using the mouse, it doesn't seem inconvenient to select and open clips in the PRV using the mouse.