Hello,
1. People use the Manske procedure for Syrian Rue to separate the harmala alkaloids from the vasicine compounds.A little research on your side won't hurt and will actually provide you with the desired answers, most of which have already been discussed on the forum and explained in the actual teks in the wiki.
Truth is that one could dismiss the manske step with rue, imo it's just a matter of preference regarding purity of end product.
2. The "iso tek for chaliponga/leaf sources" is a tek designed specifically for DMT and other nps soluble alks and could not be used for harmala sources due to the fact that harmala freebase alkaloids are poorly soluble in iso and other nps.
Quote:3. Could one combine powdered Rue or Vine with a powdered DMT source and perform the extraction on the both of them together, and then dissolve them in vinegar to put in a dropper or evaporate to end up with a crystal acetate pharmahuasca to encapsulate?
3. The answer imho is No!
There are reasons for which teks are presented the way they are, of course we all like to simplify, but everything has already been simplified to suit the average kitchen alchemist needs.
But once again, I highly advise more reading should be done as these informations you are searching for already exist imbeded in the said teks, and more research won't hurt but will actually help one get a better understanding of the simple chem processes behind it all.