Keyboard shortcuts Insert Voice only 1 - 4?

Here in the shortcuts I can only see shortcuts for 4 voices but in polyphonic voicing I have my voices set up in chorale style with 2 for the bass and two for the treble clef which means I have the bass clef on 5 and 6 so I also need to insert voices there. How can I make shortcuts for Insert to voice 5 - 6?

Oh Ok I think I get it, the 1 -4 applies to 5 -8 as well… a bit confusing there… hmmm I was hoping I could select voices using shortcuts without selecting the correct clef first, so first I will have to select the clef and then use the shortcuts. Is there a way around this?