Do you think we'd be able to sell the kids to a dairy farm with the condition that they not be killed or sold for meat?
Nope. Sale contracts like that are often just a bunch of hot air and don't hold up when actually put to the test. The moment the money changes hands, that goat becomes their property. They can do whatever they want. Those contracts are mostly just used to try and scare buyers into following what the contract says, because they don't know it is pretty much a useless piece of paper. They are just not legally valid, unless you actually had a lawyer who knew your state laws well enough to create a legally binding contract. And even if the contract was legally enforceable, it would cost you a lot to take the buyer to court.
It is like selling a car to someone, and adding in a clause that they can never drive it to Nevada. That car becomes their property once they possess the title. If they break that clause and you find out about it...you can't do anything.
You can try to screen out the buyers you think might butcher the kids. But this is no guarantee.
I hate to sound so blunt. But the reality out there is there are far more male goats out there than homes for those goats, because the world is not all happiness, rainbows, and endless pastures. They don't produce anything useful like a doe, and a herd only needs a small number of intact males to service many does. So just like all other livestock, the excess males are butchered.