sorry, i deleted my post 
but cool cool, so you’re going to use the laptop to shuffle the data between grid and crow. are you planning to use Max? I ask because…
thoughts
this could be a pretty minimally invasive job in Max – you could make a patch so that if you press the spacebar, the grid changes. or grab a USB footswitch and make that the trigger, underfoot.
I’m curious what the on-rack version looks like for you – what would you want to use to trigger the shift if you were going to purpose crow’s in2 to that function? and then I guess I’d wonder if that gesture is more or less invasive than setting up a gesture on the laptop that’ll be (necessarily) involved?
ooo keeping it on-grid: you could use a combination of grid keys that would still respect their individual functions – the way that Earthsea uses multifinger gestures to perform different actions on the same grid surface as playing notes. this might be the least invasive route
. eg. only when four grid keys held down at once, you switch to the ALT page, but those four keys when pressed individually just play notes