If you mean can you set a button to the look up view, so that you can use it as a modifier for the hat switch, yes it works.
Also you might want to look into changing "modes" or stick sets in AH to give you that expanded functionality.
The difference is thus.
Setup A
Uses button set to look up + hat switch for up views.
Setup B uses button set to switch to mode 2 + hat switch in mode 2 set for up views. In mode 2 the same button is set to switch to mode 1, so pushing it again puts you back down to flat views.
Setup B has the advantage in that the same key or button can be setup for multiple functions.
Example jstick button 4 in mode 1 is drop flaps, in mode 2 is raise flaps.
Trigger in mode 1 is primary guns only, in mode 2 is all guns (or vice versa)