I'd suggest asking this question on the mig-welding forum, as there is somebody on there who occasionally runs scraping courses, and several people who've been on his course, so will be able to advise on where to buy the required bits.

I have looked at them in the past, but I just don't have the time for scraping anything.

I suspect by grounded, they mean ground. Any edge like this has to be ground to create the cutting edge.
Main thing required for precision, is practice/patience and a very precise suitable reference surface.