Hi Darren - I happened across this thread There is any table generator like QuickChart? - #16 by Eric_Ruiz_Molero
This looks to be the perfect solution to creating a Quadrant analysis and reinforces your original proposal (of course). Except that the thread might be using Pages as opposed to an App.
Is there any chance you could create a quick demo for a basic Quadrant chart showing how to put text onto a fixed image please?