For me the Harmalas never dissolved in Naphtha and I think they are indeed insoluble. They may be soluble in MEK and in IPA, but they also mix with water. Therefore they cannot be used for a liquid-liquid extraction and I guess that is what you definetly need to do at a certain step.
So therefore the only way would be by simply freebase your stuff to pH ~ 10 + and then extract with DCM. As you cannot use distillation to remove a solvent DCM is still your friend as it evaporates rather quickly. But the last bits may take a long while to fully evaporate without any additional low heat like 40 °C.
But I think you may also pull A LOOOOT of stuff from the plants that are normally no worries, as you eat/drink the brew altogether. But when you now want to come to a nice extract this will make live complicated ... I guess with just a regular alkaline extraction you will end up with a black sludge, also filled with inactive plant components and chlorophyll and stuff ...
Because of this wild mixture and being an oil it would just be suitable to be used as a beverage again, smoking would be nasty
The nausea inducing components are also very likely be extracted, but I guess you can handle that if you would have drunk it anyway
Then again you could use fumaric acid. But as alkaloids are named based on their property to contain 1 or more amines that could potentially react as a base, all the bad guys are likely to be dropped by making the FASA method, so it also would not separate it from the goodies.
There could just be the problem that as it will very likely be an oil filled with X different components it may degrade rather fast compared to the shelf live of solid crystals. And also if there are fermented products of fungi and/or bacteria they are also likely to move into the DCM rather than staying in your brew
