If he was started on unscented and even ate that for you after you got him, then I wouldn't be so quick to scent if you don't like it since it can occasionally be a pain to reconvert them. If you don't mind the extra effort though, I sometimes think that for horribly finicky animals it may be best to let them put on some weight first that way before you try weaning them off of it. (Just throwing that out there, but IMHO your purple boy doesn't sound horribly picky if he was eating well before.)
Also to answer your question, I don't believe that the majority of westerns require scenting. A lot of breeders start them on unscented f/t right out of the egg now and others get converted later on. They typically have a voracious appetite once they get started, so that helps~
I'd try to minimize stress. Make sure he has a comfortable environment (proper temps, snug hiding places etc. etc.) and feels secure. Also I know people have different opinions on this, but I kinda feel that offering him food every three days may be too much. Sometimes I find that it's better to just leave them alone for a bit, especially for the more sensitive animals that get bugged easily, before trying again.
I tend to stick to a once a week feeding schedule myself and method-wise, I've found that cupfeeding works well for my finicky male. Just stick the food in the deli cup, stick him in the cup, and leave him be. (One pink at a time stops him from being overwhelmed.) Also if he's especially shy that day, it helps to not leave the cup out in the open or else he'll spend the entire time keeping his eye out for us whether we're there or not. He prefers places that are quiet, dark, and warm. Then it's all gone when I check on him later. A watched pot never boils I suppose...
You can also consider braining the pink to add scent and see if he likes that. I know it's disgusting, but it's more convenient than getting a fish or frog for it.
So sorry to hear your boy isn't eating right now, I know how stressful that can be so I hope this helps some. I'm wishing you the best of luck!
BTW I don't really refreeze their meals (I have done it on occasion with rats that were only out for a short while and admittedly didn't see anything wrong with it/my snake after it was eaten the next time, but I still agree with the others that it's not really worth it.) and I personally wouldn't ever do it to a pinky. Being so fragile and lacking fur, I'm assuming that they wouldn't hold up as well as an adult rodent or something...
