Normally neutered males are better at protection than the females in llamas. 12 months old is the perfect time to geld. Most vets want to do it at 12 months for bone structure but before they start having male behavioral issues. If you wait till 15 or more months with an unhandled male llama you could end up with a dangerous animals. Remember they have fighting teeth and their hooves are more like sharp talons they can use in a fight.
Yes it's nice the 4h one has been handled but you would probably end up with a show llama and not a protection llama. Females are not the llama of choice for livestock protection.
It also is very similar to LGD's in the fact you are better off if they have been raised for protection of a herd or flock. Getting a show or pet quality llama may not protect your herd at all, they may just fine but they may not.
This was our boy Loyal with his flock of Tunis sheep we used to have. We later used him with our weaning bucklings after we got out of sheep.