Numpad 0-9(as well as 0-9 above qwerty) gives access to Level Palettes 0-9, and F4 allows you to choose a specific Level palette, but we need hotkeys to quickly scroll through Level Palettes. My suggestion for which hotkeys: Home and End.
New Level Palette hotkeys?
That sounds like a good idea to me, because I'm sick and tired of having to press F4 to change palettes beyond Palette 0E.🙄
Shift + . (period) = increase current Level Pallet 1.
Shift + , (comma) = decrease current Level Pallet 1.
Alternatively, (My favorite word in the suggestions forum. Yippeee..) you can create and build with a "Template screen." One screen that you set the general dungeon stats for, then copy/paste that screen, complete with its palette, to the screens you want to lay out on the map as you'd planned, (Hopefully,) while keeping that screen intact elsewhere on that map or another.
Thus, you won't have to keep changing it screen by screen. It'll already be done for you by the time you go to set up another screen.