Yes we have hot wings in the UK
I do think our chickens are generally a lot smaller than the American ones though, in the supermarkets they are around 1.35 kg for an average sized whole bird. I get the impression yours are larger.
I will let mine have a whole wing from time to time as they are all on the slim side, they tend to leave a little bone if it is too much in one go. They are all experienced raw eaters though, and seem to know what they need.
My girls hadn't been exercised before they came to us. It took a while to build up some muscle. Now they are fit they keep weight on much better, although Mouse will always be skinny I think, it is just her build. (She eats as much as the other two, despite weighing over a pound less.)
So just keep an eye on what comes out, and go from there.