Is there a way to set a shortcut to change camera views (looking through it)?

I will give you a few ways to work with changing cameras.
Just tapping the spacebar will swap between 4 camera and then full screen on whichever view you have your mouse over.
The camera Marking Menu can be found by holding down the spacebar in the view port and clicking in the center of the MAYA box. Select the camera you want.

If you want to add a camera to this Marking Menu, go to;
WINDOW - SETTINGS/PREFERENCES - MARKING MENU EDITOR.
In the Marking Menu Editor select the fifth line down “CommonModelingPanes”
and click Edit Marking Menu.
(For this example pretend I have a camera in the scene called ShotCam)
RMB over one of the empty corner boxes and select “Edit Menu Item”
Add a label for the box, I will call it “Shot Cam”
Then type the following in the Command(s) Box;

lookThru ShotCamShape

(lookThru (whatever you named you camera + Shape)
Click “Save and Close” and then click “Save” and then “Close”...and Close once more.
Now if you hold down the space bar and click the center box you will see your new camera as an option.
This setting will stay for all your scenes, so you only need to do it once...in the future just name your working cameras the same “ShotCam” in this case.

All the best with this.
~Ben

I’ll have to come back to that one but this is pretty much what i needed, T.