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That sounds like the proper way to make changa to me. I use acetone, rather than a heavier hydrocarbon, because it evaoporates more quickly and, I imagine, more thoroughly, but no matter.

That is the general routine with changa, except why use naphtha? I mean, it would probably work but doesn't naphtha have to be warm to dissolve Spice? And I'm not sure how well it picks up the harmine from the leaves... and I feel the potential for contaminants would be higher, maybe not though. If it is clean for extracting it would probably be clean for changa. I would go with ethanol, isopropyl alcohol, or acetone though. I usually use acetone as it is the fastest-evaporating, just make sure it is clean there seems to be lots of unsavory acetone out there.

As for the q21q21's: why are you using sodium carbonate? I'm not sure it is basic enough to pull off q21's, and I've never heard of that working for anyone. Lime is very cheap and available, I guess depending on where you are. Do you live in the States? If so, simply locate a hispanic market and find the ubiquitous spice rack - it WILL be there! Under the names Lime, Lima, and Nixtamal (maybe more) and it is a fine white powder. I've gotten lime from the spice rack at a non-hispanic grocery store in my hometown but there is a large Mexican population. If you can't find it locally then Mrs. Wages is your friend!

I've cracked a glass container before doing the hot-water bath... it was a pickle jar and it instantly cracked. I usually use a thick glass measuring cup for my extractions but it only holds 150 grams at most and if I do that much I risk spilling some solvent... I try to only use thick glass for hot-water baths (and I like to do them hot. It may not be necessary but I think it does something good, even if just making the process slightly more expedient.

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If you use acetone, test it first by leaving some to evaporate in a dish. If it evaporates cleanly, it's OK, but if it leaves a residue, that's going to end up your changa.

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you can make a simple 11x caapi leaf by soaking 10 grams of finely ground caapi leaf in one of the above mentioned solvents for a while. I do 4-7 days if I'm using an alcohol, less for acetone. DMT can be added to that "menstruum", the caapi-leaf infused solvent. Then it will have enough harmine to work (I believe harmine is the only harmala alkaloid found in the leaves). I don't know how plain caapi leaf or passionflower would be with Spice... never tried!

As Wasp stated, do an evaporation test on the acetone if you use it. Don't use anything with a residue.