Mind you, there are a million factors...age, background, personality, breed, etc.
In some cases, I've had to put certain dogs together very carefully, or not at all. But, those were adults, they were dogs that had been abused, etc.
In your case, the main issue is that you have a senior and puppies. With puppies, as long as the adult dog is not intolerant of other dogs, and puppies especially, and he's not, letting them learn their life lessons, especially with dogs that they live with, is always the best policy.
Think of your dogs as a pride of lions or pack of wolves. The adults put up with a lot from the cubs/pups...chewing of their tails, climbing on them, etc. But, periodically, an adult snarls at them, sends the persnickety little one tumbling, and life goes on.
That may have to happen more than once, because little ones have more energy than sense, sometimes, but, eventually, it sinks in.
I understand you not wanting bloodshed, no one does. But, if there is, it will probably be shocking, but not dangerous to the pup. Hopefully, there will be none at all.
Their/Chelsea's behavior is not unusual at all. Pups do that when they like a dog a lot, for example.
Also, they do it to show that Fonzi's the top dog, and that they want his attention, and/or for him to play with them.
Sometimes, they get too big for their britches, and will put their paws on a dog's back. That's testing dominance.
The licking will probably just have to work itself out, but for the pawing, you might want to check that their nails are short enough not to really hurt Fonzi.
Also, check around his face/muzzle to make sure that he doesn't have any small wounds, which can also cause excessive licking by other dogs.
Since they seem paw oriented, maybe this would be a good time to take some little treats and teach them to 'high 5' or 'shake.'
Good luck; please keep us posted on this!
Love All Life, Thank You For Posting! :)