It looks like the Editor Pane goes some way towards my ideal of four separate checkers. But it needs a live internet connection; so, it is only available in Office 365; which I don't have
Regrettably, I ticked the box for Office Home and Business when I bought my Dell, I assumed there would be an affordable upgrade to Office 365 should I ever want it. There is an upgrade option, but last time I looked, the cost was borderline extortionate
BR