I failed to find any useful information regarding actual vaporization temperatures for harmala alkaloids, so decided to do my own experiment. It was pretty rough and probably not very accurate but seems promising and supports the observations stated here.
I sacrificed a small amount of harmine HCl and placed it in a piece of tinfoil shaped around a shot glass. The tinfoil was hung on a dowel rod. An infrared thermometer was used to monitor the temperature of the surface containing the harmine HCl. a small flame was ignited about 12" under the apparatus. The flame was slowly raised while monitoring the temperature. I noticed the harmine vaporizing at around 120C.
I assume that the actual temperature of vaporization was slightly higher as the thermometer was likely reading too large of an area and taking the average temperature of that area. But the stated vaporization point for DMT freebase is 150c. The 30 degree difference is way more than enough for a fudge factor in this case. I am fairly certain that the vaporization point for harmine HCl is below that of DMT freebase. I'm not sure where the idea of harmala alkaloids vaporizing at far higher temperatures than DMT came from, but I'm definitely putting it to question. My first assumption would be that it came from observations on rue seed or very rough extractions.
Now to be accurate in reporting, none of this vapor was inhaled so I have no idea if it was active. There will be more experimentation performed, but I would like to see what others find as well. That's how science works.
Science makes me giddy with excitement.