Have you thought about using lead-free solder such as is used for plumbing applications? I've used it in the past with good results.
"My beloved America, thank you for your children. If your children want to become soldiers I will train them. When they are hungry I will feed them. When they are thirsty I will give them water. When they fight for freedom I will lead them. When they are unsteady on the battlefield I will motivate them. If they die on the battlefield I will bury them. So help me God."