Intuos Pro: Shortcut to switch between Screen Area "Portion" and "Full"?

[Mandini]

Greetings,

I'm thinking of getting an Intuos Pro Large, and since I have a 21:9 ultrawide monitor, I was thinking if the following is possible?
1. Set the "Full" tablet area to a "Portion" of my monitor's screen area in a 1:1 ratio 
2. Set an express key (or any form of Win10 shortcut) to switch from the above "Portion" set-up to a "Full" screen area set-up

When using Photoshop I usually have part of my screen (about 1/3rd) for reference photo(s), while the rest of the screen I use for displaying PS. So the thinking behind this is to maintain a 1:1 ratio and not lose any of the tablet's active area when using PS, since I don't need my entire screen area. But to be able to quickly switch to a "Full" screen area setup when working outside of Photoshop. 

I would be grateful for any ideas :)