Dang, sorry you got scratched so bad.
Have you ever dangled your hand in their cage with treats in it/around it? Not a bad idea to get them to come around to the idea that hand = food bringer. My only hand-tame quails were handled from the moment they hatched, but they tend to be more feral...
You still have to feel for the lump if you can't see it. The bird will be fine, rest assured. Better to get them habituated to harmless handling than have the first time you need to hold them be during an emergency.
Edit: you can avoid scratches by not giving them anything to kick against—that...
You just grab the bird "overhand," flip them upside down, and feel/look for a bald-ish pea-sized lump between their cloaca and their tail, right near the cloaca. If you find it and press on it, a kind of white foam will come out of their vent. If there's no bump and no foam, it's probably a...
Southwest Gamebirds has a pretty good picture of a rosetta (try the second of three, a bit down the page). Even the darkest grau fee looks different from this bird.
Also, it's doubtful birds can "hate," but they for sure can become and behave wary. As long as you wait until after 6 weeks of...