Hi Andy
My Union tool & cutter grinder works reasonably well as a surface grinder for the few odd jobs that I need to do.
Unfortunately they are not that easy to find second hand, but hey do turn up now and again. I made a bespoke head for mine so I could run the wheels at a faster speed, and it also fits the cross slide of the Myford if I need to do cylindrical grinding.

This shows it grinding accurate angles on the segments of my model mill engine flywheel.

This shows it set up on the lathe, it would obviously not be used without some protection from the grinding dust.

Phil