As someone who is currently living with a much smaller but generally rambunctious F6 kitten who usually interacts with lovely gentle velvet paws, until he gets carried away and forgets, and who regularly makes me bleed and has come close to seriously injuring me, I sympathize with your predicament and can only imagine how difficult it would be dealing with this phase if he was twice the size.
In my situation the scratching tends to happen when he really wants to play and builds up too much of a head of steam before I have a chance to release that a bit with a wand toy or piece of balled up paper or whatever... The biting seems to start as affectionate licking and then progresses to chewing and biting and grabbing and bunny kicking my hand at 3 in the morning.... When he starts licking, chewing and then biting I have tried hissing, blowing in his face, sticking my finger into his mouth, removing him from my lap or bed, or just getting up and removing myself. I don't see where any of that has worked, but I do think he is starting to outgrow this. Maybe...
What does seem it might help, is I notice he is less crazy and inappropriate after I spend quieter time with him one on one, exploring our world, so he learns to listen to my cues and see me as more than a fun moving object to be pounced on. (which is how he basically sees everything) Expanding on this idea, I also noticed that clicker training my older F7 to do "tricks" really helped build a basic framework of understanding and shared communication between us. So I taught him the rather useless skill of jumping through my arms held in a circle, touching his nose to a pencil where ever I held it, and sitting. But then those same suggestions are really useful when we go for walks and I want to prevent his leash from tangling. Which then seemed to lead him to generally be quicker to understand my human suggestions and gestures mean something and might be worth listening to and co-operating with. So I am thinking I need to do more one on one basic training with the little rambunctious one, so he better understands when I yell Owwie it isn't just a fun part of the crazy wild game... So maybe building better communication using clicker training would be a place to start?
