I've had bad experiences with a solitary cade in a group of ewes and lambs - he may try to pinch off the ewes and they'll butt him. It's different if he's reared with them from the beginning, but personally I wouldn't put him in with ewes until he's weaned, at least.
He will make friends with the kids if that's his only option, but it's better for him to grow up with another of his own species if that's doable for you.
I usually only did nighttime feeds for a few days, then move to a late one just before I go to bed and get up a little bit earlier to do a very early one for a few more days. By a week or so they should be ok for seven or eight hours overnight. If it's convenient to make them wait less, it's better for them, no doubt, but I've reared loads this way and they've been fine. They have fresh water, hay/straw and creep available, and by a week old they will be starting to digest hay a little bit.