Perhaps surrendering him to a rescue where he CAN get the veterinary care that he needs might be the best solution right now.
Separating them during feeding does not solve the domination problem. A dominated animal (they're not cuddling, btw), is more prone to fasting, suppressed immune system, and illnesses.
Just look at the pictures you've posted - he NEEDS medical attention. You've asked for suggestions, separating them is what any of us will tell you.
You can pick up a six quart tub for $1, and get a UTH and thermostat for him and separate him from the female.
Otherwise, you're going to quite literally - love him to death.