I've never had any experience with opiates, especially pure opium. However, I know through reading on other forums that the burning/active temperature is quite high; and probably higher than any other substrates that the vaporizers we are using are designed to vaporizer.
However, since you have a manual, flame controlled vape; you may very well be able to get it to a high enough temperature to vaporize the opium. However, please be careful; this is a drug with the power to enslave man and god alike and it is playing with fire in my opinion.