Hey vector,
You can just boil the caapi leaf in water, and have 10x enhanced caapi leaf in a day. I've never tried the alcohol extraction though. Really I think waiting a month for 10x caapi leaf is a waste of time.
Caapi leaf water only method
But, 10x caapi leaf infused with dmt does not stand up to changa made with freebase harmalas.
10x is a decent smoke, but the synergy between the harmalas (salt form) and the dmt is definitely missing, in my opinion. The 10x changa did not lengthen the experience, although it did slow the intensity considerably.
Changa with harmalas is the only way to go, the synergy is definitely there, with the trips lasting 20-30 minutes consistently.
You can extract your harmalas and infuse your changa in a few days.
I wouldn't make 10x caapi extract, it's overrated, I'm not convinced of the level of activity of the harmala salts that are in 10x caapi.