I don't know if I've just been lucky but I've had 6 cockerel now and
not one of them has displayed bad behaviour beyond Sylv giving my hand a peck when he felt the girls were threatened.
The two Swedish Flower boys I had - Leo and Matilda - were absolute sweethearts and had great manners with the ladies. Neither were at all aggressive. Even full size they'd both sit on my shoulder and snuggle. They both had to be re-homed through absolutely no fault of their own but I'm still in touch with their new owners and neither have any issues with them. I still get to see Leo and he comes running to me as soon as he sees me.
Before I even got hens, i rescued a roo that had been dumped on our allotments. He was re-homed with a family who had two little girls and he used to sit in their laps and escort them round the property. He was very protective of them.
Sylv was a lovely boy and Ferdy has an even softer temperament. I can literally do anything with him. Stanley is turning into as much of a cuddlebug as his dad. Time will tell whether his hormones will turn him into a nightmare but fingers crossed

I've always handled them a lot. Sylv and Leo were 8 wks when I got them. Matilda was 2 wks and raised in the kitchen as a lone chick so had a lot of cuddles and handling. Ferdy and Stanley have been handled since hatching. I do spoil them rotten and do everything you're told not to do, including having them sit on my shoulder.
I think having older, experienced hens also helps as they teach little pip squeak snots good manners. They don't stand for any nonsense like young pulletts do.
In fact, the only chicken I've had problems with was Penelope. She was a terrible biter. She would take any opportunity to bite my face in particular. I tried all the holding her down techniques. Didn't work at all. Pecking her with my hand worked to an extent but she'd peck me back if she thought she'd get away with it. She did it as a teenager and I think although my intervention helped, she just grew out of it. She hasn't bitten me in over 6 months now.
I think you need to work out
why he's doing it. Is it because he sees you as a rival or he's protecting his flock etc? Alfie, the roo dumped on our allotments, attacked through fear. He was very wary and frightened of people and would try to attack. I got him to a stage where he'd take food from my hand, be picked up, carried and come when called. I didn't have ladies then so he had no distractions.
Maybe it's worth taking Joey away from the girls for a while? See if that stops or reduces his attacking behaviour?
Your photo of him on his back made me laugh so much! Sylv used to do the exact same thing!