This really sounds like more of an engineering problem than a chemistry problem.
When I, as a chemist, want to prevent something from combusting my first instinct is to inert the system by flushing with nitrogen or another inert gas. If you can't use nitrogen, maybe argon?
Alternatively, you might try a non-flammable solvent such as dichloromethane or chloroform. I have no idea how you would deliver them as a gas to contacts though.
If you can't use anything other than isopropanol and you can't use inert gas, I don't know if I can help you.