It'd be so much easier, right? Make it so when you get a Pokémon judged, there's a second row of markings above the manual ones. A mark corresponding to each stat, and above that blue pentagon I don't know the meaning of, another symbol that shows how high he judged the stats to be.
I don't know what you'd use the manual marking system for if this happened, but whatever.
"Remember to believe in magic, or I'll kill you." My 3DS Friend Code: 0705 - 3328 - 1003
You ask about one Pokémon, open the menu, update the markings, and repeat. Go for more in a row if they only have one or two perfect IVs. Minimal room for error, and it wouldn't really take that much longer.