I want to preserve as much chip ram as possible, I'm assuming this will allow me to do that better (will also have to kill other screens too).
But probably the additional space that intuition takes is not much bigger (or at least not in chip ram). Will have to look at this in more detail later...
Intuition screens take the same amount if chip ram. You could call CloseWorkbench() to get rid of Workbench screen but usually it is not desired and such techniques are usable only on floppy systems...
Or just kill the OS and bang HW directly :-)